clang-cl: Add /MP[n] to the list of unsupported and ignored flags

This flag tells cl.exe to use up to n processes to compile the provided
source files.  I have no plans to implement this in clang.

llvm-svn: 188729
diff --git a/clang/test/Driver/cl-options.c b/clang/test/Driver/cl-options.c
index 14c3c07..3eee634 100644
--- a/clang/test/Driver/cl-options.c
+++ b/clang/test/Driver/cl-options.c
@@ -102,7 +102,7 @@
 // RUN: %clang_cl /Zs /EHsc /Fdfoo /fp:precise /Gd /GL /GL- -- %s 2>&1
 // RUN: %clang_cl /Zs /Gm /Gm- /GS /Gy /Gy- /GZ -- %s 2>&1
 // RUN: %clang_cl /Zs /RTC1 /wfoo /Zc:wchar_t- -- %s 2>&1
-// RUN: %clang_cl /Zs /ZI /Zi -- %s 2>&1
+// RUN: %clang_cl /Zs /ZI /Zi /MP -- %s 2>&1
 
 
 // We support -Xclang for forwarding options to cc1.