Collapse boiler-plate LambdaContext iteration code

The boiler-plate code, repeated at least 7 times --

- TranslationContext<?> localContext = context();
- while (localContext != null) {
- if (localContext.tree.hasTag(LAMBDA)) {
- /** do something with **/ (LambdaTranslationContext)localContext
- }
- localContext = localContext.prev;
- }


+ for (LambdaTranslationContext ctx = lambdaContext; ctx != null; ctx = ctx.enclosingLambda()) {
+ /** do something with **/ ctx
+ }

or possibly take it higher level.