[clang] [llvm] [Clang][RISCV] Support -fcf-protection=return for RISC-V (PR #112477)

[Ming-Yi Lai via cfe-commits]

================
@@ -607,6 +607,9 @@ class RISCVTargetCodeGenInfo : public TargetCodeGenInfo {
     auto *Fn = cast<llvm::Function>(GV);
 
     Fn->addFnAttr("interrupt", Kind);
+
+    if (CGM.getCodeGenOpts().CFProtectionReturn)
----------------
mylai-mtk wrote:

The early exit above may render this line unreachable for normal functions.

https://github.com/llvm/llvm-project/pull/112477