[llvm] [LLVM][AsmParser] Make error reporting of lexer errors more precise (PR #111077)

[Rahul Joshi via llvm-commits]

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jurahul wrote:

These 2 files have strings with zero in them. for the LLVM value name. Both now show "error: Null bytes are not allowed in names" as opposed to "expected instruction opcode" which is less precise.

https://github.com/llvm/llvm-project/pull/111077