[llvm] [ARM][TableGen][MC] Change the ARM mnemonic operands to be optional for ASM parsing (PR #83436)

[Sergei Barannikov via llvm-commits]

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@@ -7118,6 +7161,11 @@ bool ARMAsmParser::ParseInstruction(ParseInstructionInfo &Info, StringRef Name,
     }
   }
 
+  // This marks the end of the LHS Mnemonic operators
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s-barannikov wrote:

Statements should end with a period. Please make sure other comments are fixed as well.

https://github.com/llvm/llvm-project/pull/83436