[clang] [clang][driver] Don't warn when -S and -c are used together without -fsyntax-only (PR #104477)

[Fangrui Song via cfe-commits]

MaskRay wrote:

> Fixes https://github.com/llvm/llvm-project/issues/104347

I made a comment on #104347  . The warning for `-S -c` works as intended.

https://github.com/llvm/llvm-project/pull/104477