[clang] [Clang] Add support for scoped atomic thread fence (PR #115545)

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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 a9cd941f392dbf99ddfcde9721bd5c485823bdf0 5b5806d9e9b516cb74d75237e493941d5bab8128 --extensions c,cpp -- clang/test/CodeGen/scoped-fence-ops.c clang/lib/CodeGen/CGBuiltin.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index 2ec3770ecd..4d22390c21 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -5191,8 +5191,8 @@ RValue CodeGenFunction::EmitBuiltinExpr(const GlobalDecl GD, unsigned BuiltinID,
       default: // invalid order
         ContBB->eraseFromParent();
         return RValue::get(nullptr);
-      case 1:  // memory_order_consume
-      case 2:  // memory_order_acquire
+      case 1: // memory_order_consume
+      case 2: // memory_order_acquire
         OrderBBs[Builder.GetInsertBlock()] = llvm::AtomicOrdering::Acquire;
         break;
       case 3: // memory_order_release

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https://github.com/llvm/llvm-project/pull/115545