[clang-tools-extra] [clang-tidy] Fix handling --driver-mode= (PR #66553)

[Radosław Śnieżek via cfe-commits]

rsniezek wrote:

Is there any chance this could land in the near future? CMake is currenlty passing the driver mode as extra-arg-before which, as I understand, is not utilized without this PR. I've opened an issue on cmake to pass the driver mode after the -- delimiter but not sure if this will land. 

I currenlty have broken checks when using  cmake integration due to the compiler intrinsics (xmmintrin.h) being leaked from 3rd party lib to my codebase and without driver-mode after --, clang-tidy crashes.

https://github.com/llvm/llvm-project/pull/66553