Add NEON support to x86_64

Change-Id: I7961ee68c04eb1d4442795ecd32329dc03f05ed0
diff --git a/utils/TableGen/NeonEmitter.cpp b/utils/TableGen/NeonEmitter.cpp
index be833c8..81ce296 100644
--- a/utils/TableGen/NeonEmitter.cpp
+++ b/utils/TableGen/NeonEmitter.cpp
@@ -2229,7 +2229,7 @@
   OS << "#ifndef __ARM_NEON_H\n";
   OS << "#define __ARM_NEON_H\n\n";
 
-  OS << "#if defined(__i386__)\n";
+  OS << "#if defined(__i386__) || defined(__x86_64__)\n";
   OS << "#include \"arm_neon_x86.h\"\n";
   OS << "#else\n";
 
@@ -2384,7 +2384,7 @@
 
   OS << "\n";
   OS << "#undef __ai\n\n";
-  OS << "#endif // __i386__\n\n";
+  OS << "#endif // __i386__ || __x86_64__\n\n";
   OS << "#endif /* __ARM_NEON_H */\n";
 }