Slava Pestov 2c21b81910 AST: Clean up archetype mangling ...

Now that we have ArchetypeBuilder::mapTypeOutOfContext(), we can
delete some tricky hand-crafted logic for getting the depth and
index of archetypes.

Notice that the depth of an archetype is now the same as generic
parameters, where depth 0 is the outermost generic context.
Previously it was backwards.

Mostly NFC, except that a few IDE crashers are now fixed because
of asserts firing in removed code, and also the change to depth
mangling (which I think makes sense, and it matches what's written
in docs/ABI.rst).

2016-06-01 12:54:43 -07:00

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