[gn build] Port 85f08c4

Author: llvmgnsyncbot

llvm/utils/gn/secondary/clang/lib/Headers/BUILD.gn

@@ -173,6 +173,7 @@ copy("Headers") {
     "invpcidintrin.h",
     "iso646.h",
     "keylockerintrin.h",
+    "larchintrin.h",
     "limits.h",
     "lwpintrin.h",
     "lzcntintrin.h",