[clang][Tooling] Prefer -x over -std when interpolating
Currently interpolation logic prefers -std over -x. But the latter is a
more strong signal, so this patch inverts the order and only makes use of -std
if -x didn't exist.
Thanks @sammccall for tracking this down!
Subscribers: ilya-biryukov, usaxena95, cfe-commits, sammccall
Differential Revision: https://reviews.llvm.org/D71727