Add support for eachOf/allOf/anyOf variadic matchers in the dynamic layer.

Summary:
Add support for eachOf/allOf/anyOf variadic matchers in the dynamic layer.
These function require some late binding behavior for the type conversions, thus changes in VariadicValue's MatcherList.

Reviewers: klimek

CC: cfe-commits, revane

Differential Revision: http://llvm-reviews.chandlerc.com/D1531