Added explicit lock/unlock methods so Sherlock can grab the
	interpreter lock as needed.

	- partially addressed 3084320 - JavaScriptCore crash

        * kjs/internal.cpp:
        (InterpreterImp::InterpreterImp):
        (InterpreterImp::lock):
        (InterpreterImp::unlock):
        * kjs/internal.h:
        * kjs/interpreter.cpp:
        (Interpreter::lock):
        (Interpreter::unlock):
        * kjs/interpreter.h:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@2935 268f45cc-cd09-0410-ab3c-d52691b4dbfc