Share reading/validation code between elem exprs & other const exprs #2288
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This continues the work from #1783 and reduces special handling of elem exprs, by treating them the same as other const expressions (init expressions).
Fixes #2201 (now allows global.get in an elem expr)
This is a prerequisite for updating the testsuite (spun out from #2287). It seemed cleaner to do it this way than to add a
OnElemSegmentElemExpr_GlobalGet
to all the readers and validators, given that the validation rules are the same as when global.get appears in any other const expression.