[clang] [Clang][Driver] Warn about `-c/-S` with `-fsyntax-only` (PR #98607)

[Martin Storsjö via cfe-commits]

mstorsjo wrote:

FWIW, in addition to `-c` in combination with `-fsyntax-only`, this now also warns for `-c` in combination with `-E`.

That sounds like a reasonable thing to do to me, so it's probably fine, but it'd be nice to have that aspect acknowledged as one intended behaviour change as well.

https://github.com/llvm/llvm-project/pull/98607