[clang] [Clang] Fix logical error in 'if else' condition that lead to an unreachable code (PR #95666)

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sstwcw wrote:

I suggest removing the second block.  The first block was intended for handling the backtick character.  The second block was intended for handling the hash character.  I messed things up when I made the code treat the backtick character like the hash character.  I will figure out if the second block is really needed and add a test if it is needed.

https://github.com/llvm/llvm-project/pull/95666