[compiler-rt] [compiler-rt] Fix incorrect usages of check_cxx_compiler_flag (PR #83779)

[Sergei Barannikov via llvm-commits]

s-barannikov wrote:

> These checks have been broken since https://github.com/llvm/llvm-project/commit/6afe972195454a1110ed8d20c6f2a547e6366379.

Actually, they have been broken since https://github.com/llvm/llvm-project/commit/f051c1ded40970169cda84b0966331ae7ad424ed.

My [previous attempts](https://reviews.llvm.org/D146920) to land this patch were unsuccessful. @nikic does this patch work for you now?


https://github.com/llvm/llvm-project/pull/83779