[clang] [lldb] [llvm] Remove some `try_compile` CMake checks for compiler flags (PR #92953)

[Vlad Serebrennikov via cfe-commits]

Endilll wrote:

@vvereschaka Thank you for letting me know! I wonder how this got past our pre- and post-commit CI, because we do build lldb with MSVC there. You fix makes total sense, so I applied it.

https://github.com/llvm/llvm-project/pull/92953