Add CoreOption flag to "-coverage" option to make it available for clang-cl

Summary:
The -coverage option is not a CoreOption, so it is not available to clang-cl.
This patch adds the CoreOption flag to "-coverage" to allow it to be used with clang-cl.

Reviewers: rnk

Reviewed By: rnk

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D38221

llvm-svn: 317709
diff --git a/clang/test/Driver/coverage.c b/clang/test/Driver/coverage.c
new file mode 100644
index 0000000..339c4a3
--- /dev/null
+++ b/clang/test/Driver/coverage.c
@@ -0,0 +1,7 @@
+// Test coverage flag.
+//
+// RUN: %clang_cl -### -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
+// CLANG-CL-COVERAGE-NOT: unknown argument