[llvm] [RISCV][MC] Support imm symbol in parseCSRSystemRegister (PR #112007)

[Mark Zhuang via llvm-commits]

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@@ -1891,6 +1894,47 @@ ParseStatus RISCVAsmParser::parseCSRSystemRegister(OperandVector &Operands) {
     if (getParser().parseExpression(Res))
       return ParseStatus::Failure;
 
+    if (Kind == AsmToken::Identifier) {
+      auto SRE = dyn_cast<MCSymbolRefExpr>(Res);
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zqb-all wrote:

done, thanks

https://github.com/llvm/llvm-project/pull/112007