Since r215885 libJavaScriptCore does not link in debug (tested on gcc 6.2.0 for mips32 target). This is solved by including JSCInlines.h in ObjectInitializationScope.cpp.
Created attachment 309199 [details] Patch Patch fixing the issue.
Comment on attachment 309199 [details] Patch r=me
Comment on attachment 309199 [details] Patch Clearing flags on attachment: 309199 Committed r216264: <http://trac.webkit.org/changeset/216264>
All reviewed patches have been landed. Closing bug.