Joe Pamer a18bedf079 Factor the constraint-favoring machinery out of the constraint generation process, and re-work it into a series of passes over an expression sub-tree. ...

Aside from tidying things up, doing this results in some significant benefits:
- Allows for global constraint ordering optimizations over a given expression, not just on a peephole basis.
- Eliminates a set of order-dependent bugs in the solver that have been dogging us for a while. (rdar://problem/19459079)
- Brings another set of tyvar-to-tyvar solving problems out of the realm of the exponential. (rdar://problem/19005271)
- Opens up the possibility of optimizing constraints during later solving phases - not just while generating them.

Swift SVN r24693

2015-01-23 23:10:50 +00:00

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