Classfile API cleanup of labelToBci from CodeModel and CodeBuilder and removal of impl.LabelResolver

[Brian Goetz]

> I propose to remove CodeBuilder::labelToBci as it is just another 
> exposure of internal functionality and should not serve to users.

Worse, it is not reliable.  If you have a BufferedCB, if you call 
labelToBCI, you'll get an unhelpful "I don't know".  And you don't know 
when you have a buffered CB; you get one in certain forms of transform 
composition.

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