Registry.h should not depend on CommandLine.h.

Split Support/Registry.h into two files so that we have less to
recompile every time CommandLine.h is changed.

llvm-svn: 62312

llvm/lib/CodeGen/ShadowStackGC.cpp

@@ -31,6 +31,7 @@
 #include "llvm/CodeGen/GCStrategy.h"
 #include "llvm/IntrinsicInst.h"
 #include "llvm/Module.h"
+#include "llvm/Support/Compiler.h"
 #include "llvm/Support/IRBuilder.h"
 
 using namespace llvm;