[clang] [llvm] [RISCV] Add Andes XAndesperf (Andes Performance) extension. (PR #135110)

[Sam Elliott via cfe-commits]

================
@@ -940,6 +947,14 @@ struct RISCVOperand final : public MCParsedAsmOperand {
         [](int64_t Imm) { return Imm != INT64_MIN && isInt<5>(Imm - 1); });
   }
 
+  bool isSImm18() const { return isBareSimmNLsbK<18, 0>(); }
+
+  bool isSImm18Lsb0() const { return isBareSimmNLsb0<18>(); }
+
+  bool isSImm19Lsb00() const { return isBareSimmNLsbK<19, 2>(); }
+
+  bool isSImm20Lsb000() const { return isBareSimmNLsbK<20, 3>(); }
----------------
lenary wrote:

if these accept bare symbols, please call them `isBareSimm...`, and if they 
don't, they shouldn't be using `isBareSimmN` internally.

https://github.com/llvm/llvm-project/pull/135110
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