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

[Jonathan Thackray via llvm-commits]

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@@ -1943,7 +1945,7 @@ class ARMOperand : public MCParsedAsmOperand {
 
       // And be in the right range, depending on the amount that it is shifted
       // by.  Shift 0, is equal to 7 unsigned bits, the sign bit is set
-      // separately.
+      // ly.
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jthackray wrote:

Nit: unintended change?

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