Suppress -Wunused-but-set-variable in Bison-generated code Recent Clang versions have enhanced the warning, causing it to fire in preprocessor_tab_autogen.cpp and glslang_tab_autogen.cpp. Since those are generated by Bison, we can't fix the code and instead should suppress the warning there. Bug: chromium:1309955 Change-Id: I31aa83571162310bef47a7ce84841446713a2d04 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3550200 Commit-Queue: Hans Wennborg <hans@chromium.org> Auto-Submit: Hans Wennborg <hans@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>