fix 128 bit int alignment on arm64

Fixes #2403

src/build_settings.cpp

@@ -519,7 +519,7 @@ gb_global TargetMetrics target_darwin_amd64 = {
 gb_global TargetMetrics target_darwin_arm64 = {
 	TargetOs_darwin,
 	TargetArch_arm64,
-	8, 8, 8, 16,
+	8, 8, 16, 16,
 	str_lit("arm64-apple-macosx"), // NOTE: Changes during initialization based on build flags.
 	str_lit("e-m:o-i64:64-i128:128-n32:64-S128"),
 };

src/llvm_abi.cpp

@@ -275,7 +275,7 @@ gb_internal i64 lb_alignof(LLVMTypeRef type) {
 	case LLVMIntegerTypeKind:
 		{
 			unsigned w = LLVMGetIntTypeWidth(type);
-			return gb_clamp((w + 7)/8, 1, build_context.ptr_size);
+			return gb_clamp((w + 7)/8, 1, build_context.max_align);
 		}
 	case LLVMHalfTypeKind:
 		return 2;