Various fixes related to using the "this" variable explicitly #1
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PR raised on top of eclipse-ee4j#2218, which already contains some necessary fixes needed.
When the "this" variable is used explicitly, it's virtual but needs to be skipped
in expressions that expect a virtual variable.
The problem was that expressions like 'this.field' were treated as
if 'this' was a field on the implicit variable.
Fixes eclipse-ee4j#2197, eclipse-ee4j#2198, and eclipse-ee4j#2199