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

[Jesse Huang 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)
----------------
jaidTw wrote:

I'm not quite familiar with the code here, is it safe to put at the beginning? 
Or I should put it after the FD check

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