[llvm] [ARM] FIX: change `pkhtb` custom parsing produce NoMatch rather than Error (PR #85765)

[Alfie Richards via llvm-commits]

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@@ -6173,7 +6187,7 @@ ParseStatus ARMAsmParser::parseFPImm(OperandVector &Operands) {
 
   Parser.Lex(); // Eat '#' or '$'.
 
-  // Handle negation, as that still comes through as a separate token.
+  // Handle negation, as that still comes through as a  token.
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AlfieRichardsArm wrote:

Yeah just added them all back, and ran the formatter properly. Sorry about that!

https://github.com/llvm/llvm-project/pull/85765