[llvm] [Xtensa] Implement Xtensa Floating Point Option. (PR #136086)

[Matt Arsenault via llvm-commits]

================
@@ -596,25 +597,33 @@ ParseStatus XtensaAsmParser::parseRegister(OperandVector &Operands,
   if (AllowParens && getLexer().is(AsmToken::LParen)) {
     size_t ReadCount = getLexer().peekTokens(Buf);
     if (ReadCount == 2 && Buf[1].getKind() == AsmToken::RParen) {
-      if ((Buf[0].getKind() == AsmToken::Integer) && (!SR))
+      if ((Buf[0].getKind() == AsmToken::Integer) &&
+          (RegType == Xtensa_Generic))
----------------
arsenm wrote:

```suggestion
      if (Buf[0].getKind() == AsmToken::Integer &&
          RegType == Xtensa_Generic)
```

https://github.com/llvm/llvm-project/pull/136086