[gn build] Port a3dc949

Author: llvmgnsyncbot

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

@@ -176,6 +176,7 @@ copy("Headers") {
     "tbmintrin.h",
     "tgmath.h",
     "tmmintrin.h",
+    "tsxldtrkintrin.h",
     "unwind.h",
     "vadefs.h",
     "vaesintrin.h",