get indexer for clr types
get indexer for clr types

resolves https://github.com/peachpiecompiler/peachpie/issues/750

iolevel/peachpie,iolevel/peachpie-concept,iolevel/peachpie-concept,iolevel/peachpie,peachpiecompiler/peachpie,iolevel/peachpie,peachpiecompiler/peachpie,iolevel/peachpie-concept,peachpiecompiler/peachpie