[PATCH 0/5] MR6958: Silence unused variable warning in bison-generated files.

[Jacek Caban (＠jacek)]

Continuation of !5704 for cases not covered by CI. As far as I can tell, these variables have been unused in all versions of Bison, but older versions of Clang (or other compilers) didn’t detect this, likely skipping the analysis due to the size or complexity of the generated code. When Clang started emitting warnings, upstream Bison partially addressed the issue by [marking the variables as unused](https://git.savannah.gnu.org/cgit/bison.git/commit/?id=a166d5450e3f47587b98f...). However, these markings remain ineffective in Clang MSVC mode due to hardcoded assumptions. My attempts to address this issue upstream in Bison have not received a response.