[PATCH] clang-check should ignore -no-integrated-as because certain drivers can't handle it

[Artyom Skrobov]

Hello,

r194968 (reviewed at http://llvm-reviews.chandlerc.com/D2039) has changed
the behaviour of clang-check w.r.t. -no-integrated-as argument: previously,
it was silently ignored; now, it's used to create the Compilation, and then
ignored further down the flow.

r194992 had to XFAIL test/Tooling/multi-jobs.cpp on the grounds that "MSVC
targeted drivers (*-win32) are incapable of invoking external assembler."
These drivers cannot create the Compilation when -no-integrated-as argument
is present.

Our patch restores the original behaviour, that is, silently ignoring
-no-integrated-as. This allows to un-XFAIL test/Tooling/multi-jobs.cpp.

OK to commit?
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