Remove undefined functions in ScriptContext.h
Remove undefined functions in ScriptContext.h

These member functions are declared in ScriptContext.h, but are not defined in ScriptContext.cpp:
LeaveScriptStartCore, CleanEvalMapCache, AddFunctionBodyToPropIdMap.

This patch removes them, since they are not used.

mrkmarron/ChakraCore,mrkmarron/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,mrkmarron/ChakraCore,mrkmarron/ChakraCore,mrkmarron/ChakraCore,Microsoft/ChakraCore,mrkmarron/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,mrkmarron/ChakraCore