[cmake] Fix `-fno-lifetime-dse` not being passed to GCC

A follow-up to #92953. This should fix unexpected performance gains when Clang is built with GCC, and fix downstream LTO crashes reported in https://github.com/llvm/llvm-project/commit/4feae05c6abda364a9295aecfa600d7d4e7dfeb6#r142466703