disable regressed test from LLVM 18 upgrade

tracked by #19824

Author: andrewrk

test/behavior/shuffle.zig

@@ -55,6 +55,13 @@ test "@shuffle bool 1" {
     if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
     if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
 
+    if (builtin.zig_backend == .stage2_llvm and
+        builtin.cpu.arch == .aarch64 and builtin.os.tag == .windows)
+    {
+        // https://github.com/ziglang/zig/issues/19824
+        return error.SkipZigTest;
+    }
+
     const S = struct {
         fn doTheTest() !void {
             var x: @Vector(4, bool) = [4]bool{ false, true, false, true };