[clang] [Clang] Define `__WCHAR_MIN__` and related macros (PR #208135)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h,c -- clang/lib/Frontend/InitPreprocessor.cpp clang/lib/Headers/stdint.h clang/test/Preprocessor/init-aarch64.c clang/test/Preprocessor/init-riscv.c clang/test/Preprocessor/init.c --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Headers/stdint.h b/clang/lib/Headers/stdint.h
index 2471b6e38..07c325421 100644
--- a/clang/lib/Headers/stdint.h
+++ b/clang/lib/Headers/stdint.h
@@ -807,14 +807,14 @@ typedef __UINTMAX_TYPE__ uintmax_t;
 /* C99 7.18.3 Limits of other integer types. */
 #define SIG_ATOMIC_MIN __SIG_ATOMIC_MIN__
 #define SIG_ATOMIC_MAX __SIG_ATOMIC_MAX__
-#define WINT_MIN       __WINT_MIN__
-#define WINT_MAX       __WINT_MAX__
+#define WINT_MIN __WINT_MIN__
+#define WINT_MAX __WINT_MAX__
 
 #ifndef WCHAR_MAX
 # define WCHAR_MAX __WCHAR_MAX__
 #endif
 #ifndef WCHAR_MIN
-# define WCHAR_MIN __WCHAR_MIN__
+#define WCHAR_MIN __WCHAR_MIN__
 #endif
 
 /* 7.18.4.2 Macros for greatest-width integer constants. */

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https://github.com/llvm/llvm-project/pull/208135