- port x64 assembly code to MASM

- improve stack unwindability on x64 for GCC by not modifying RBP/RSP registers in inline assembly

pch.h

@@ -1,13 +1,21 @@
 #ifndef CRYPTOPP_PCH_H
 #define CRYPTOPP_PCH_H
 
-#include "config.h"
+#ifdef CRYPTOPP_GENERATE_X64_MASM
+
+	#include "cpu.h"
+
+#else
+
+	#include "config.h"
+
+	#ifdef USE_PRECOMPILED_HEADERS
+		#include "simple.h"
+		#include "secblock.h"
+		#include "misc.h"
+		#include "smartptr.h"
+	#endif
 
-#ifdef USE_PRECOMPILED_HEADERS
-#include "simple.h"
-#include "secblock.h"
-#include "misc.h"
-#include "smartptr.h"
 #endif
 
 #endif