[gn build] Port 58a17e1

Author: llvmgnsyncbot

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

@@ -126,6 +126,7 @@ copy("Headers") {
     "adxintrin.h",
     "altivec.h",
     "ammintrin.h",
+    "amxavx512intrin.h",
     "amxcomplexintrin.h",
     "amxfp16intrin.h",
     "amxfp8intrin.h",