John McCall 7f22faf968 Substantially rework how SILGen handles bridging as part of laying the ...

ground work for the syntactic bridging peephole.

- Pass source and dest formal types to the bridging routines in addition
  to the dest lowered type.  The dest lowered type is still necessary
  in order to handle non-standard abstraction patterns for the dest type.

- Change bridging abstraction patterns to store bridged formal types
  instead of the formal type.

- Improve how SIL type lowering deals with import-as-member patterns.

- Fix some AST bugs where inadequate information was being stored in
  various expressions.

- Introduce the idea of a converting SGFContext and use it to regularize
  the existing id-as-Any conversion peephole.

- Improve various places in SILGen to emit directly into contexts.

2017-07-11 12:45:13 -04:00

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