Adds json/document-wrapper.h (#257)

Author: James Chen

json/document-wrapper.h

@@ -0,0 +1,16 @@
+#pragma once
+
+// Wrapper file for document.h to fix the crash bug (https://github.com/cocos2d/cocos2d-x/issues/16492)
+
+// Bug in gcc 4.9.0 on ARM with ARM instruction set, -O2 causes the bug
+// This gcc version cannot use #pragma GCC push_options/pop_options as well. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59884
+
+#include "json/rapidjson.h"
+
+#if defined(__arm__) && defined(RAPIDJSON_GNUC) && RAPIDJSON_GNUC >= RAPIDJSON_VERSION_CODE(4,9,0) && RAPIDJSON_GNUC < RAPIDJSON_VERSION_CODE(5,0,0)
+    #pragma GCC optimize ("O1")
+#endif    
+#include "document.h"
+#if defined(__arm__) && defined(RAPIDJSON_GNUC) && RAPIDJSON_GNUC >= RAPIDJSON_VERSION_CODE(4,9,0) && RAPIDJSON_GNUC < RAPIDJSON_VERSION_CODE(5,0,0)
+    #pragma GCC reset_options
+#endif