llvm.Builder: revert adding !nosanitize API

It's not actually useful after all.

src/codegen/llvm/Builder.zig

@@ -3994,7 +3994,6 @@ pub const Function = struct {
     names: [*]const String = &[0]String{},
     value_indices: [*]const u32 = &[0]u32{},
     strip: bool,
-    any_nosanitize: bool,
     debug_locations: std.AutoHashMapUnmanaged(Instruction.Index, DebugLocation) = .{},
     debug_values: []const Instruction.Index = &.{},
     extra: []const u32 = &.{},
@@ -4091,7 +4090,6 @@ pub const Function = struct {
             block,
             br,
             br_cond,
-            br_cond_nosanitize,
             call,
             @"call fast",
             cmpxchg,
@@ -4347,13 +4345,6 @@ pub const Function = struct {
                     else => unreachable,
                 };
             }
-
-            pub fn isNosanitize(self: Tag) bool {
-                return switch (self) {
-                    .br_cond_nosanitize => true,
-                    else => false,
-                };
-            }
         };
 
         pub const Index = enum(u32) {
@@ -4376,7 +4367,6 @@ pub const Function = struct {
                 return switch (wip.instructions.items(.tag)[@intFromEnum(self)]) {
                     .br,
                     .br_cond,
-                    .br_cond_nosanitize,
                     .ret,
                     .@"ret void",
                     .@"switch",
@@ -4390,7 +4380,6 @@ pub const Function = struct {
                 return switch (wip.instructions.items(.tag)[@intFromEnum(self)]) {
                     .br,
                     .br_cond,
-                    .br_cond_nosanitize,
                     .fence,
                     .ret,
                     .@"ret void",
@@ -4481,7 +4470,6 @@ pub const Function = struct {
                     .block => .label,
                     .br,
                     .br_cond,
-                    .br_cond_nosanitize,
                     .fence,
                     .ret,
                     .@"ret void",
@@ -4668,7 +4656,6 @@ pub const Function = struct {
                     .block => .label,
                     .br,
                     .br_cond,
-                    .br_cond_nosanitize,
                     .fence,
                     .ret,
                     .@"ret void",
@@ -5113,7 +5100,6 @@ pub const WipFunction = struct {
     instructions: std.MultiArrayList(Instruction),
     names: std.ArrayListUnmanaged(String),
     strip: bool,
-    any_nosanitize: bool,
     debug_locations: std.AutoArrayHashMapUnmanaged(Instruction.Index, DebugLocation),
     debug_values: std.AutoArrayHashMapUnmanaged(Instruction.Index, void),
     extra: std.ArrayListUnmanaged(u32),
@@ -5160,7 +5146,6 @@ pub const WipFunction = struct {
             .instructions = .{},
             .names = .{},
             .strip = options.strip,
-            .any_nosanitize = false,
             .debug_locations = .{},
             .debug_values = .{},
             .extra = .{},
@@ -6452,7 +6437,7 @@ pub const WipFunction = struct {
                     .@"ret void",
                     .@"unreachable",
                     => {},
-                    .br_cond, .br_cond_nosanitize => {
+                    .br_cond => {
                         const extra = self.extraData(Instruction.BrCond, instruction.data);
                         instruction.data = wip_extra.addExtra(Instruction.BrCond{
                             .cond = instructions.map(extra.cond),
@@ -6639,7 +6624,6 @@ pub const WipFunction = struct {
         function.names = names.ptr;
         function.value_indices = value_indices.ptr;
         function.strip = self.strip;
-        function.any_nosanitize = self.any_nosanitize;
         function.debug_locations = debug_locations;
         function.debug_values = debug_values;
     }
@@ -8553,7 +8537,6 @@ pub fn init(options: Options) Allocator.Error!Builder {
 
     try self.metadata_string_indices.append(self.gpa, 0);
     assert(try self.metadataString("") == .none);
-    assert(try self.debugTuple(&.{}) == .empty_tuple);
 
     return self;
 }
@@ -8951,7 +8934,6 @@ pub fn addFunctionAssumeCapacity(
             .kind = .{ .function = function_index },
         }),
         .strip = undefined,
-        .any_nosanitize = false,
     });
     return function_index;
 }
@@ -9599,12 +9581,6 @@ pub fn printUnbuffered(
             });
         }
         if (function.instructions.len > 0) {
-            const maybe_empty_tuple: ?u32 = if (!function.any_nosanitize) null else b: {
-                const gop = try metadata_formatter.map.getOrPut(self.gpa, .{
-                    .metadata = .empty_tuple,
-                });
-                break :b @intCast(gop.index);
-            };
             var block_incoming_len: u32 = undefined;
             try writer.writeAll(" {\n");
             var maybe_dbg_index: ?u32 = null;
@@ -9794,14 +9770,6 @@ pub fn printUnbuffered(
                             }),
                         }
                     },
-                    .br_cond_nosanitize => {
-                        const extra = function.extraData(Function.Instruction.BrCond, instruction.data);
-                        try writer.print("  br {%}, {%}, {%}", .{
-                            extra.cond.fmt(function_index, self),
-                            extra.then.toInst(&function).fmt(function_index, self),
-                            extra.@"else".toInst(&function).fmt(function_index, self),
-                        });
-                    },
                     .call,
                     .@"call fast",
                     .@"musttail call",
@@ -10080,9 +10048,6 @@ pub fn printUnbuffered(
                 if (maybe_dbg_index) |dbg_index| {
                     try writer.print(", !dbg !{}", .{dbg_index});
                 }
-                if (instruction.tag.isNosanitize()) {
-                    try writer.print(", !nosanitize !{d}", .{maybe_empty_tuple.?});
-                }
                 try writer.writeByte('\n');
             }
             try writer.writeByte('}');