gn build: Merge r361607

llvm-svn: 361640
diff --git a/llvm/utils/gn/secondary/llvm/lib/CodeGen/BUILD.gn b/llvm/utils/gn/secondary/llvm/lib/CodeGen/BUILD.gn
index 222978c..f91e00f 100644
--- a/llvm/utils/gn/secondary/llvm/lib/CodeGen/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/lib/CodeGen/BUILD.gn
@@ -161,6 +161,7 @@
     "StackMaps.cpp",
     "StackProtector.cpp",
     "StackSlotColoring.cpp",
+    "SwiftErrorValueTracking.cpp",
     "TailDuplication.cpp",
     "TailDuplicator.cpp",
     "TargetFrameLoweringImpl.cpp",