[clang] [Clang] Make Unlabeled the default control flow branch label scheme (PR #223297)

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


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``````````bash
git-clang-format --diff origin/main HEAD --extensions c,cpp,h -- clang/lib/Basic/Targets/RISCV.cpp clang/lib/Basic/Targets/RISCV.h clang/test/CodeGen/RISCV/riscv-cf-protection.c --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Basic/Targets/RISCV.cpp b/clang/lib/Basic/Targets/RISCV.cpp
index df99a0def..5a8dda521 100644
--- a/clang/lib/Basic/Targets/RISCV.cpp
+++ b/clang/lib/Basic/Targets/RISCV.cpp
@@ -651,7 +651,7 @@ bool RISCVTargetInfo::checkCFBranchLabelSchemeSupported(
   // implements it
   switch (Scheme) {
   case CFBranchLabelSchemeKind::Default:
-   return true;
+    return true;
   case CFBranchLabelSchemeKind::Unlabeled:
     return true;
   case CFBranchLabelSchemeKind::FuncSig:

``````````

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https://github.com/llvm/llvm-project/pull/223297