[libunwind] libunwind: Do not use __attribute__((target("gcs"))) with non-clang … (PR #138077)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions h,c -- libunwind/src/UnwindLevel1.c libunwind/src/shadow_stack_unwind.h
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<details>
<summary>
View the diff from clang-format here.
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``````````diff
diff --git a/libunwind/src/UnwindLevel1.c b/libunwind/src/UnwindLevel1.c
index ccc36fab1..f3b451ad9 100644
--- a/libunwind/src/UnwindLevel1.c
+++ b/libunwind/src/UnwindLevel1.c
@@ -191,7 +191,8 @@ extern int __unw_step_stage2(unw_cursor_t *);
 __attribute__((target("+gcs")))
 #endif
 static _Unwind_Reason_Code
-unwind_phase2(unw_context_t *uc, unw_cursor_t *cursor, _Unwind_Exception *exception_object) {
+unwind_phase2(unw_context_t *uc, unw_cursor_t *cursor,
+              _Unwind_Exception *exception_object) {
   __unw_init_local(cursor, uc);
 
   _LIBUNWIND_TRACE_UNWINDING("unwind_phase2(ex_obj=%p)",
@@ -336,8 +337,8 @@ __attribute__((target("+gcs")))
 #endif
 static _Unwind_Reason_Code
 unwind_phase2_forced(unw_context_t *uc, unw_cursor_t *cursor,
-                     _Unwind_Exception *exception_object,
-                     _Unwind_Stop_Fn stop, void *stop_parameter) {
+                     _Unwind_Exception *exception_object, _Unwind_Stop_Fn stop,
+                     void *stop_parameter) {
   __unw_init_local(cursor, uc);
 
   // uc is initialized by __unw_getcontext in the parent frame. The first stack
@@ -443,7 +444,6 @@ unwind_phase2_forced(unw_context_t *uc, unw_cursor_t *cursor,
   return _URC_FATAL_PHASE2_ERROR;
 }
 
-
 /// Called by __cxa_throw.  Only returns if there is a fatal error.
 _LIBUNWIND_EXPORT _Unwind_Reason_Code
 _Unwind_RaiseException(_Unwind_Exception *exception_object) {

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https://github.com/llvm/llvm-project/pull/138077