[clang] [llvm] Revert "[llvm][clang] Allocate a new stack instead of spawning a new … (PR #135865)

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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 cpp,h -- clang/include/clang/Basic/Stack.h clang/lib/Basic/Stack.cpp clang/lib/Frontend/CompilerInstance.cpp llvm/include/llvm/Support/CrashRecoveryContext.h llvm/include/llvm/Support/thread.h llvm/lib/Support/CrashRecoveryContext.cpp
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<details>
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Basic/Stack.cpp b/clang/lib/Basic/Stack.cpp
index aa15d8e66..98dc2f0d2 100644
--- a/clang/lib/Basic/Stack.cpp
+++ b/clang/lib/Basic/Stack.cpp
@@ -15,7 +15,7 @@
 #include "llvm/Support/CrashRecoveryContext.h"
 
 #ifdef _MSC_VER
-#include <intrin.h>  // for _AddressOfReturnAddress
+#include <intrin.h> // for _AddressOfReturnAddress
 #endif
 
 static LLVM_THREAD_LOCAL void *BottomOfStack = nullptr;
@@ -66,9 +66,11 @@ bool clang::isStackNearlyExhausted() {
 void clang::runWithSufficientStackSpaceSlow(llvm::function_ref<void()> Diag,
                                             llvm::function_ref<void()> Fn) {
   llvm::CrashRecoveryContext CRC;
-  CRC.RunSafelyOnThread([&] {
-    noteBottomOfStack();
-    Diag();
-    Fn();
-  }, DesiredStackSize);
+  CRC.RunSafelyOnThread(
+      [&] {
+        noteBottomOfStack();
+        Diag();
+        Fn();
+      },
+      DesiredStackSize);
 }

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https://github.com/llvm/llvm-project/pull/135865