[9] Review request for 8152551: Null pointer crash in JSC::speculationFromCell (jfxwebkit.dll)

[dmitry markov]

Hello Kevin, Guru,

Could you review a fix for 9, please?
    bug: https://bugs.openjdk.java.net/browse/JDK-8152551
    webrev: http://cr.openjdk.java.net/~dmarkov/8152551/webrev.00/

Added a check to prevent null pointer crash inside speculationFromCell() 
function.

Thanks,
Dmitry