Jordan Rose 2b5a2ad84c Rework the integrated REPL to use separate modules for every line ...

...like LLDB does, instead of parsing into a single SourceFile.
This does break some functionality:

- no more :dump_ast
- no redeclaration checking, but no shadowing either---redeclarations
  just become ambiguous
- pretty much requires EnableAccessControl to be off, since we don't
  walk decls to promote them to 'public'

...but it allows us to remove a bit of longstanding support for
type-checking / SILGen-ing / IRGen-ing only part of a SourceFile that
was only used by the integrated REPL.

...which, need I remind everyone, is still /deprecated/...but sometimes
convenient. So most of it still works.

2018-09-25 09:13:52 -07:00

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