Remove the TODO I left in commit
a07b135ce0c0111bd83450b5dc29ef0381cdbc39.
We will now warn about `-c/-S` with `-fsyntax-only`. This relands #98607
with a specific target triple.
Emit warning that `-S` and/or `-c` arguments are not used if
`-fsyntax-only` is also passed to clang
`addPGOAndCoverageFlags` is not the right place
to produce this warning
Now `-fsyntax-only -c/-S` combination handles like `-fsyntax-only -E` in
`BuildJobs()` driver function