swift234

Solver: try binding collection literals before non-collection literals.

Trying a collection literal early often means that we can determine
the element type from context, which saves us the work of trying to
guess at the element type firsthand.

Doing this seems to help some cases significantly: 
  - test/stdlib/ArrayNew.swift got about 20% faster in a release build
  - I had to drop the threshold for the "expression too complex" test
    case by 20x to still trigger the issue.






Swift SVN r22097