Updating truffle import in graal-core

[Andreas Woess]

Hi,
I'm going to update graal-core to the latest truffle version (42f2bdc).
Please let me know asap if I should hold off on this for some reason.
Notable changes in truffle are:

* Deprecate support for the "identifier" associated with each SourceSection
* Remove deprecated instrumentation API package
com.oracle.truffle.api.instrument and all its classes.
* Remove deprecated API method TruffleLanguage#isInstrumentable(Node),
TruffleLanguage#getVisualizer(), TruffleLanguage#createWrapperNode(),
TruffleLanguage.Env#instrumenter(), RootNode#applyInstrumentation()
* Remove deprecated API Debugger#setTagBreakpoint
* Remove deprecated API RootNode#applyInstrumentation
* Remove deprecated tagging API in SourceSection and Source.
* new TCK tests

- andreas