Don't use -msse2 in test/Driver/cl-options.c

It's already tested in cl-x86-flags.c, and can only be used
when targeting X86.

llvm-svn: 213179

clang/test/Driver/cl-options.c

@@ -301,7 +301,6 @@
 // RUN:     -fno-strict-aliasing \
 // RUN:     -fstrict-aliasing \
 // RUN:     -mllvm -disable-llvm-optzns \
-// RUN:     -msse2 \
 // RUN:     -Wunused-variables \
 // RUN:     /Zs -- %s 2>&1