FogBugz (Case [Issue]11256) Kernel - ifNil instead of isNil ifTrue

A FogBugz case was opened by Clement Bera.

Case ID:      11256
Title:        ifNil instead of isNil ifTrue
Status:       Work Needed
Category:     Enhancement
Project:      Kernel
Area:         Misc
Priority:     4 - Would be nice
Milestone:    Pharo3.0: 30/03/2014
Assigned To:  Everyone

URL:          https://pharo.fogbugz.com/default.asp?11256

So I bench and ifNil, ifNotNil are 1.75x faster than isNil ifTrue:, isNil ifFalse:

So I modified 189 isNil ifTrue: to ifNil: .

This results in some speedup, for instance:
- some string speedup
- RBParser speedup (good for Opal)


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