Slava Pestov 4ed09b4a73 SILOptimizer: Remove some workarounds for old problems ...

It looks like the devirtualizer used to have problems computing
method types in the presence of generic substitutions, covariant
returns and other things, so it would bail if a perticular set
of pre-conditions was not met on the types of original method call
and the devirtualized method call.

I don't think any of this is necessary anymore. If this patch
introduces any regressions, we need to fix the root cause instead
of re-introducing this logic.

2017-02-27 00:03:46 -08:00

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