std: disable tests regressed from LLVM 14

lib/std/fmt.zig

@@ -2623,6 +2623,12 @@ test "vector" {
         return error.SkipZigTest;
     }
 
+    if (builtin.zig_backend == .stage1) {
+        // Regressed in LLVM 14:
+        // https://github.com/llvm/llvm-project/issues/55522
+        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/mem.zig

@@ -331,6 +331,12 @@ pub fn zeroes(comptime T: type) T {
 }
 
 test "zeroes" {
+    if (builtin.zig_backend == .stage1 or builtin.zig_backend == .stage2_llvm) {
+        // Regressed in LLVM 14:
+        // https://github.com/llvm/llvm-project/issues/55522
+        return error.SkipZigTest;
+    }
+
     const C_struct = extern struct {
         x: u32,
         y: u32,
@@ -370,9 +376,9 @@ test "zeroes" {
         },
 
         array: [2]u32,
-        vector_u32: meta.Vector(2, u32),
-        vector_f32: meta.Vector(2, f32),
-        vector_bool: meta.Vector(2, bool),
+        vector_u32: @Vector(2, u32),
+        vector_f32: @Vector(2, f32),
+        vector_bool: @Vector(2, bool),
         optional_int: ?u8,
         empty: void,
         sentinel: [3:0]u8,

lib/std/simd.zig

@@ -382,6 +382,12 @@ test "vector prefix scan" {
         return error.SkipZigTest;
     }
 
+    if (builtin.zig_backend == .stage1 or builtin.zig_backend == .stage2_llvm) {
+        // Regressed in LLVM 14:
+        // https://github.com/llvm/llvm-project/issues/55522
+        return error.SkipZigTest;
+    }
+
     const int_base = @Vector(4, i32){ 11, 23, 9, -21 };
     const float_base = @Vector(4, f32){ 2, 0.5, -10, 6.54321 };
     const bool_base = @Vector(4, bool){ true, false, true, false };

lib/std/zig/fmt.zig

@@ -41,7 +41,7 @@ test "isValidId" {
     try std.testing.expect(!isValidId("a b c"));
     try std.testing.expect(!isValidId("3d"));
     try std.testing.expect(!isValidId("enum"));
-    try std.testing.expect(!isValidId("i386"));
+    try std.testing.expect(isValidId("i386"));
 }
 
 /// Print the string as escaped contents of a double quoted or single-quoted string.