[compiler-rt] [compiler-rt] Hardened altsigstack unmap fix from PR #179000 (PR #196460)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- compiler-rt/test/asan/TestCases/Posix/multiple_sigaltstack.cpp compiler-rt/test/asan/TestCases/Posix/sigaltstack-replaced-by-app.cpp compiler-rt/lib/asan/asan_thread.cpp compiler-rt/lib/asan/asan_thread.h compiler-rt/lib/sanitizer_common/sanitizer_common.h compiler-rt/lib/sanitizer_common/sanitizer_fuchsia.cpp compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cpp compiler-rt/lib/sanitizer_common/sanitizer_win.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_common.h b/compiler-rt/lib/sanitizer_common/sanitizer_common.h
index 996d34ff5..1f09c50e9 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_common.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_common.h
@@ -388,7 +388,7 @@ void ReportDeadlySignal(const SignalContext &sig, u32 tid,
 
 // Alternative signal stack (POSIX-only).
 struct AlternateSignalStack {
-  void *sp;
+  void* sp;
   uptr size;
 };
 AlternateSignalStack SetAlternateSignalStack();

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https://github.com/llvm/llvm-project/pull/196460