test: Disable a bunch of vector behavior tests for hexagon.

Most of the failures are:

* https://github.com/llvm/llvm-project/issues/118879
* https://github.com/llvm/llvm-project/issues/134659

But some are also miscompilations leading to wrong results. I'm not going to
investigate the latter further until all the backend crashes have been resolved.

test/behavior.zig

@@ -104,7 +104,11 @@ test {
     _ = @import("behavior/union_with_members.zig");
     _ = @import("behavior/usingnamespace.zig");
     _ = @import("behavior/var_args.zig");
+    // https://github.com/llvm/llvm-project/issues/118879
+    // https://github.com/llvm/llvm-project/issues/134659
+    if (!(builtin.zig_backend == .stage2_llvm and builtin.cpu.arch == .hexagon)) {
         _ = @import("behavior/vector.zig");
+    }
     _ = @import("behavior/void.zig");
     _ = @import("behavior/while.zig");
     _ = @import("behavior/widening.zig");

test/behavior/cast.zig

@@ -621,6 +621,7 @@ test "@intCast on vector" {
     if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest;
     if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest;
     if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
+    if (builtin.zig_backend == .stage2_llvm and builtin.cpu.arch == .hexagon) return error.SkipZigTest;
 
     const S = struct {
         fn doTheTest() !void {
@@ -2697,6 +2698,7 @@ test "@intCast vector of signed integer" {
     if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest;
     if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
+    if (builtin.zig_backend == .stage2_llvm and builtin.cpu.arch == .hexagon) return error.SkipZigTest;
 
     var x: @Vector(4, i32) = .{ 1, 2, 3, 4 };
     _ = &x;

test/behavior/floatop.zig

@@ -241,6 +241,7 @@ test "vector cmp f16" {
     if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest;
     if (builtin.cpu.arch.isArm()) return error.SkipZigTest;
     if (builtin.cpu.arch.isPowerPC64()) return error.SkipZigTest;
+    if (builtin.zig_backend == .stage2_llvm and builtin.cpu.arch == .hexagon) return error.SkipZigTest;
 
     try testCmpVector(f16);
     try comptime testCmpVector(f16);
@@ -254,6 +255,7 @@ test "vector cmp f32" {
     if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest;
     if (builtin.cpu.arch.isArm()) return error.SkipZigTest;
     if (builtin.cpu.arch.isPowerPC64()) return error.SkipZigTest;
+    if (builtin.zig_backend == .stage2_llvm and builtin.cpu.arch == .hexagon) return error.SkipZigTest;
 
     try testCmpVector(f32);
     try comptime testCmpVector(f32);
@@ -266,6 +268,7 @@ test "vector cmp f64" {
     if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest;
     if (builtin.cpu.arch.isArm()) return error.SkipZigTest;
     if (builtin.cpu.arch.isPowerPC64()) return error.SkipZigTest;
+    if (builtin.zig_backend == .stage2_llvm and builtin.cpu.arch == .hexagon) return error.SkipZigTest;
 
     try testCmpVector(f64);
     try comptime testCmpVector(f64);
@@ -281,6 +284,7 @@ test "vector cmp f128" {
     if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest;
     if (builtin.cpu.arch.isArm()) return error.SkipZigTest;
     if (builtin.cpu.arch.isPowerPC64()) return error.SkipZigTest;
+    if (builtin.zig_backend == .stage2_llvm and builtin.cpu.arch == .hexagon) return error.SkipZigTest;
 
     try testCmpVector(f128);
     try comptime testCmpVector(f128);

test/behavior/math.zig

@@ -1899,6 +1899,7 @@ test "partially-runtime integer vector division would be illegal if vector eleme
     if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest;
     if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
+    if (builtin.zig_backend == .stage2_llvm and builtin.cpu.arch == .hexagon) return error.SkipZigTest;
 
     var lhs: @Vector(2, i8) = .{ -128, 5 };
     const rhs: @Vector(2, i8) = .{ 1, -1 };

test/behavior/select.zig

@@ -71,6 +71,7 @@ test "@select compare result" {
     if (builtin.zig_backend == .stage2_riscv64) return error.SkipZigTest;
     if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest;
     if (builtin.zig_backend == .stage2_x86_64 and builtin.target.ofmt != .elf and builtin.target.ofmt != .macho) return error.SkipZigTest;
+    if (builtin.zig_backend == .stage2_llvm and builtin.cpu.arch == .hexagon) return error.SkipZigTest;
 
     const S = struct {
         fn min(comptime V: type, lhs: V, rhs: V) V {