behavior,std: disable tests triggering LLVM 15 bug

This bug is newly triggered by these tests since some values are now
correctly promoted to comptime-known constants.

Tracked by ziglang#13782

Author: mlugg

lib/std/fmt.zig

@@ -2756,6 +2756,11 @@ test "vector" {
         return error.SkipZigTest;
     }
 
+    if (builtin.zig_backend == .stage2_llvm and builtin.cpu.arch.endian() == .Big) {
+        // https://github.com/ziglang/zig/issues/13782
+        return error.SkipZigTest;
+    }
+
     const vbool: @Vector(4, bool) = [_]bool{ true, false, true, false };
     const vi64: @Vector(4, i64) = [_]i64{ -2, -1, 0, 1 };
     const vu64: @Vector(4, u64) = [_]u64{ 1000, 2000, 3000, 4000 };

lib/std/hash/auto_hash.zig

@@ -408,6 +408,11 @@ test "testHash union" {
 }
 
 test "testHash vector" {
+    if (@import("builtin").zig_backend == .stage2_llvm and @import("builtin").cpu.arch.endian() == .Big) {
+        // https://github.com/ziglang/zig/issues/13782
+        return error.SkipZigTest;
+    }
+
     const a: @Vector(4, u32) = [_]u32{ 1, 2, 3, 4 };
     const b: @Vector(4, u32) = [_]u32{ 1, 2, 3, 5 };
     try testing.expect(testHash(a) == testHash(a));

test/behavior/vector.zig

@@ -14,6 +14,11 @@ test "implicit cast vector to array - bool" {
     if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
 
+    if (builtin.zig_backend == .stage2_llvm and builtin.cpu.arch.endian() == .Big) {
+        // https://github.com/ziglang/zig/issues/13782
+        return error.SkipZigTest;
+    }
+
     const S = struct {
         fn doTheTest() !void {
             const a: @Vector(4, bool) = [_]bool{ true, false, true, false };
@@ -492,6 +497,11 @@ test "vector comparison operators" {
     if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_spirv64) return error.SkipZigTest;
 
+    if (builtin.zig_backend == .stage2_llvm and builtin.cpu.arch.endian() == .Big) {
+        // https://github.com/ziglang/zig/issues/13782
+        return error.SkipZigTest;
+    }
+
     const S = struct {
         fn doTheTest() !void {
             {