The attached changeset fixes the debugger highlighting problem reported
by Mike Roberts (thanks Mike).
>From preamble: Reverts back to skipping over highlighting of jumpIfTrue
and jumpIfFalse, since the bytecode representation can be significantly
different then the source code.  Also adds pc binding to
ifNil:/ifNotNil: message nodes so they get highlighted on send: == to
nil, instead of erroneously highlighting the next send.

Mike Roberts <mike at mjr104.co.uk> wrote:
> I think there is a bug in the debugger that it is not correctly showing the
> green highlighted 'where' area.  
> If you "debug it" on "nil ifNil: [Transcript show:'hello ']"
> The highlighted 'where' area is "show: 'hello '" .  
> However you haven't asked the debugger to send ifNil: to nil yet.
> You need to press send three times to end up in TranscriptStream>>show: .
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