[clang] [compiler-rt] Add SignalSanitizer (PR #172086)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- compiler-rt/lib/sigsan/sigsan.cpp clang/include/clang/Driver/SanitizerArgs.h clang/lib/Driver/ToolChains/CommonArgs.cpp clang/lib/Driver/ToolChains/Linux.cpp --diff_from_common_commit
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View the diff from clang-format here.
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``````````diff
diff --git a/compiler-rt/lib/sigsan/sigsan.cpp b/compiler-rt/lib/sigsan/sigsan.cpp
index f14ed9357..939562f52 100644
--- a/compiler-rt/lib/sigsan/sigsan.cpp
+++ b/compiler-rt/lib/sigsan/sigsan.cpp
@@ -204,7 +204,8 @@ SIGSAN_INTERCEPTOR(FILE *, freopen, (path, mode, stream), const char *path,
                    const char *mode, FILE *stream)
 
 // GNU stdio
-SIGSAN_INTERCEPTOR(int, vasprintf, (strp, fmt, ap), char **strp, const char *fmt, va_list ap)
+SIGSAN_INTERCEPTOR(int, vasprintf, (strp, fmt, ap), char **strp,
+                   const char *fmt, va_list ap)
 INTERCEPTOR(int, asprintf, char **strp, const char *fmt, ...) {
   va_list ap;
   va_start(ap, fmt);
@@ -226,7 +227,8 @@ INTERCEPTOR(void, syslog, int priority, const char *format, ...) {
   va_end(ap);
 }
 
-SIGSAN_INTERCEPTOR(int, pthread_mutex_init, (mutex, mutexattr), pthread_mutex_t *mutex, const pthread_mutexattr_t *mutexattr)
+SIGSAN_INTERCEPTOR(int, pthread_mutex_init, (mutex, mutexattr),
+                   pthread_mutex_t *mutex, const pthread_mutexattr_t *mutexattr)
 SIGSAN_INTERCEPTOR(int, pthread_mutex_lock, (mutex), pthread_mutex_t *mutex)
 SIGSAN_INTERCEPTOR(int, pthread_mutex_trylock, (mutex), pthread_mutex_t *mutex)
 SIGSAN_INTERCEPTOR(int, pthread_mutex_unlock, (mutex), pthread_mutex_t *mutex)

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https://github.com/llvm/llvm-project/pull/172086