Add workarounds for LLVM-113633.

Author: StephanTLavavej

tests/std/tests/P0088R3_variant/test.cpp

@@ -32,6 +32,11 @@
 
 #if !defined(_PREFAST_) || !defined(_M_IX86) // TRANSITION, VSO-1639191
 
+#ifndef __clang__ // TRANSITION, LLVM-113633
+#define __SIZEOF_DOUBLE__      8
+#define __SIZEOF_LONG_DOUBLE__ 8
+#endif // ^^^ workaround ^^^
+
 #define _SILENCE_CXX20_VOLATILE_DEPRECATION_WARNING
 #define _LIBCXX_IN_DEVCRT
 #include <msvc_stdlib_force_include.h> // Must precede any other libc++ headers

tests/std/tests/P0088R3_variant_msvc/test.cpp

@@ -1,6 +1,11 @@
 // Copyright (c) Microsoft Corporation.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
+#ifndef __clang__ // TRANSITION, LLVM-113633
+#define __SIZEOF_DOUBLE__      8
+#define __SIZEOF_LONG_DOUBLE__ 8
+#endif // ^^^ workaround ^^^
+
 #define _SILENCE_CXX23_ALIGNED_UNION_DEPRECATION_WARNING
 #define _LIBCXX_IN_DEVCRT
 #include <msvc_stdlib_force_include.h> // Must precede any other libc++ headers

tests/std/tests/P0220R1_any/test.cpp

@@ -26,6 +26,11 @@
 // Yes, this is an awkward hand process; notably the required headers can change without notice. We should investigate
 // running the libc++ tests directly in all of our configurations so we needn't replicate this subset of files.
 
+#ifndef __clang__ // TRANSITION, LLVM-113633
+#define __SIZEOF_DOUBLE__      8
+#define __SIZEOF_LONG_DOUBLE__ 8
+#endif // ^^^ workaround ^^^
+
 #define _LIBCXX_IN_DEVCRT
 #include <msvc_stdlib_force_include.h> // Must precede any other libc++ headers
 #include <stdlib.h>

tests/std/tests/P0220R1_optional/test.cpp

@@ -28,6 +28,11 @@
 // Yes, this is an awkward hand process; notably the required headers can change without notice. We should investigate
 // running the libc++ tests directly in all of our configurations so we needn't replicate this subset of files.
 
+#ifndef __clang__ // TRANSITION, LLVM-113633
+#define __SIZEOF_DOUBLE__      8
+#define __SIZEOF_LONG_DOUBLE__ 8
+#endif // ^^^ workaround ^^^
+
 #define _LIBCXX_IN_DEVCRT
 #include <msvc_stdlib_force_include.h> // Must precede any other libc++ headers
 #include <stdlib.h>