[clang] [Clang][RISCV] Add preprocessor macros for Zicfilp CFI scheme (PR #109600)

[Craig Topper via cfe-commits]

================
@@ -134,6 +134,25 @@ class RISCVTargetInfo : public TargetInfo {
 
   bool validateGlobalRegisterVariable(StringRef RegName, unsigned RegSize,
                                       bool &HasSizeMismatch) const override;
+
+  bool checkCFProtectionBranchSupported() const override {
+    return ISAInfo->hasExtension("zicfilp");
----------------
topperc wrote:

Branch protection doesn't really require zicfilp. The encoding of lpad is a 
valid encoding on all RISC-V CPUs. That's why x86 only checks that the CPU is 
at least a PentiumPro.

https://github.com/llvm/llvm-project/pull/109600
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