Chris Lattner a0fa5d11b4 Implement SE-0195, which introduces "Dynamic Member Lookup" Types (#14546) ...

* Implement the recently accepted SE-0195 proposal, which introduces "Dynamic
Member Lookup" Types.  This is a dusted off and updated version of PR13361,
which switches from DynamicMemberLookupProtocol to @dynamicMemberLookup as
was requested by the final review decision.  This also rebases it,
updates it for other changes in the compiler, fixes a bunch of bugs, and adds support for keypaths.  

Thank you to @rudx and @DougGregor in particular for the helpful review comments and test cases!

2018-02-16 16:19:50 -08:00

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