This needs to be done before the merge from master so that we can properly verify the infrastructure changes.

Implemented  ref conditional operator (aka: ternary ref)

OHI tests for ref readonly

IDE support for ref readonly/in tokens in completion service

Adds support for  binding `ref readonly` style of `in` parameters.

Merge branch 'features/readonly-ref' of https://www.github.com/dotnet/roslyn into ide-support-for-ref-readonly

Implements binding for `ref readonly` returns and `in` parameters.

NOTE: binding of `ref readonly` parameters is NYI

Implementing parser changes for "ref readonly"

 `readonly ref` local functions, error tolerance in parsing, more tests.

Parse readonly ref parameters

Correclty handle local functions.