[clang] [llvm] [NFC] Add comments for PR “[LLVM][CLANG] Update signal‑handling behavior to comply with POSIX” (PR #183206)

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


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<details>
<summary>
You can test this locally with the following command:
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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang/tools/driver/driver.cpp --diff_from_common_commit
``````````

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The reproduction instructions above might return results for more than one PR
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<details>
<summary>
View the diff from clang-format here.
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``````````diff
diff --git a/clang/tools/driver/driver.cpp b/clang/tools/driver/driver.cpp
index 9e200f103..fa110e998 100644
--- a/clang/tools/driver/driver.cpp
+++ b/clang/tools/driver/driver.cpp
@@ -381,7 +381,8 @@ int clang_main(int Argc, char **Argv, const llvm::ToolContext &ToolContext) {
   if (!UseNewCC1Process) {
     TheDriver.CC1Main = ExecuteCC1WithContext;
     // Ensure the CC1Command actually catches cc1 crashes
-    llvm::CrashRecoveryContext::Enable(/*NeedsPOSIXUtilitySignalHandling=*/true);
+    llvm::CrashRecoveryContext::Enable(
+        /*NeedsPOSIXUtilitySignalHandling=*/true);
   }
 
   std::unique_ptr<Compilation> C(TheDriver.BuildCompilation(Args));

``````````

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https://github.com/llvm/llvm-project/pull/183206