[clang-cl] Ignore space-separated /AI arguments
The /AI flag is for #using directives, which I don't think we support.
This is consistent with how the /I flag is handled by MSVC.  Add a test
for it.
Differential Revision: https://reviews.llvm.org/D57189
llvm-svn: 352119
diff --git a/clang/test/Driver/cl-options.c b/clang/test/Driver/cl-options.c
index f5171d5c..4087ef3 100644
--- a/clang/test/Driver/cl-options.c
+++ b/clang/test/Driver/cl-options.c
@@ -387,6 +387,7 @@
 // (/Zs is for syntax-only)
 // RUN: %clang_cl /Zs \
 // RUN:     /AIfoo \
+// RUN:     /AI foo_does_not_exist \
 // RUN:     /Bt \
 // RUN:     /Bt+ \
 // RUN:     /clr:pure \