[gn build] Port 3bc88eb3924f

GitOrigin-RevId: 68744bb4792125ff7f0108e265a589a17465b299
diff --git a/utils/gn/secondary/lld/MachO/BUILD.gn b/utils/gn/secondary/lld/MachO/BUILD.gn
index 98c3839..22fee55 100644
--- a/utils/gn/secondary/lld/MachO/BUILD.gn
+++ b/utils/gn/secondary/lld/MachO/BUILD.gn
@@ -23,6 +23,8 @@
   ]
   sources = [
     "Arch/ARM64.cpp",
+    "Arch/ARM64Common.cpp",
+    "Arch/ARM64_32.cpp",
     "Arch/X86_64.cpp",
     "Driver.cpp",
     "DriverUtils.cpp",