gn build: Merge r374903

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@374904 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/gn/secondary/clang/lib/Sema/BUILD.gn b/utils/gn/secondary/clang/lib/Sema/BUILD.gn
index ab7486d..1cb84fe 100644
--- a/utils/gn/secondary/clang/lib/Sema/BUILD.gn
+++ b/utils/gn/secondary/clang/lib/Sema/BUILD.gn
@@ -40,6 +40,7 @@
     "SemaCast.cpp",
     "SemaChecking.cpp",
     "SemaCodeComplete.cpp",
+    "SemaConcept.cpp",
     "SemaConsumer.cpp",
     "SemaCoroutine.cpp",
     "SemaDecl.cpp",