llvm/test/CMakeLists.txt: Add llvm-cov in "check-clang".

llvm-svn: 185801
GitOrigin-RevId: fed0ccfb9ce71c92af6bdcf1d7db04df7b8b1482
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index c9c9573..392f5f2 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -22,6 +22,7 @@
           llvm-ar
           llvm-as
           llvm-bcanalyzer
+          llvm-cov
           llvm-diff
           llvm-dis
           llvm-extract