[PATCH] [clang-cl] Ignore the /o option when /P is specified.

[Hans Wennborg]

LGTM with comment.


================
Comment at: test/Driver/cl-outputs.c:266
@@ -265,3 +265,3 @@
 // Fio4: "-E"
-// Fio4: "-o" "foo.x"
+// Fio4: "-o" "cl-outputs.i"
 
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We probably don't need all four test cases for /P with /o anymore.

I think we should also have a note explaining the expected behaviour: that /o doesn't affect /P.

http://reviews.llvm.org/D10313

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