gn build: Merge r364288.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@364374 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/gn/secondary/llvm/lib/Target/ARM/BUILD.gn b/utils/gn/secondary/llvm/lib/Target/ARM/BUILD.gn
index 4618e26..a7d3bda 100644
--- a/utils/gn/secondary/llvm/lib/Target/ARM/BUILD.gn
+++ b/utils/gn/secondary/llvm/lib/Target/ARM/BUILD.gn
@@ -80,6 +80,7 @@
     "ARMInstructionSelector.cpp",
     "ARMLegalizerInfo.cpp",
     "ARMLoadStoreOptimizer.cpp",
+    "ARMLowOverheadLoops.cpp",
     "ARMMCInstLower.cpp",
     "ARMMachineFunctionInfo.cpp",
     "ARMMacroFusion.cpp",