gn build: Merge r358390

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@358397 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/gn/secondary/llvm/unittests/Support/BUILD.gn b/utils/gn/secondary/llvm/unittests/Support/BUILD.gn
index 00a5bfa..527c7fc 100644
--- a/utils/gn/secondary/llvm/unittests/Support/BUILD.gn
+++ b/utils/gn/secondary/llvm/unittests/Support/BUILD.gn
@@ -31,6 +31,7 @@
     "ErrnoTest.cpp",
     "ErrorOrTest.cpp",
     "ErrorTest.cpp",
+    "FileCheckTest.cpp",
     "FileOutputBufferTest.cpp",
     "FormatVariadicTest.cpp",
     "GlobPatternTest.cpp",