Fix coverage test on Windows bot

llvm-svn: 318559
diff --git a/clang/test/Driver/coverage.c b/clang/test/Driver/coverage.c
index 9cfba81..f6bfbfb 100644
--- a/clang/test/Driver/coverage.c
+++ b/clang/test/Driver/coverage.c
@@ -1,7 +1,7 @@
 // Test coverage flag.
 // REQUIRES: system-windows
 //
-// RUN: %clang_cl -### -coverage %s -o foo/bar.o 2>&1 | FileCheck -check-prefix=CLANG-CL-COVERAGE %s
+// RUN: %clang_cl -Wno-msvc-not-found -### -coverage %s -o foo/bar.o 2>&1 | FileCheck -check-prefix=CLANG-CL-COVERAGE %s
 // CLANG-CL-COVERAGE-NOT: error:
 // CLANG-CL-COVERAGE-NOT: warning:
 // CLANG-CL-COVERAGE-NOT: argument unused