add test case for ignoring -flto=auto and -flto=jobserver

as requested in https://reviews.llvm.org/D99501, test that the two new options are ignored.

Reviewed By: tejohnson, fhahn

Differential Revision: https://reviews.llvm.org/D100484

GitOrigin-RevId: 56cb214b38a70c0fc824ab096e500d78c72b44ef
1 file changed