Add support for .bind("foo") expressions on the dynamic matchers.

Summary: Add support on the parser, registry, and DynTypedMatcher for binding IDs dynamically.

Reviewers: klimek

CC: cfe-commits, revane

Differential Revision: http://llvm-reviews.chandlerc.com/D911

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@183144 91177308-0d34-0410-b5e6-96231b3b80d8
__uint128_t is only available on 64 bit platforms, only test it when it's around.

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@183146 91177308-0d34-0410-b5e6-96231b3b80d8
UnresolvedMemberExpr should have an expr location of the member (not the base)

This matches the behavior of MemberExpr and makes diagnostics such as
"reference to non-static member function must be called" more legible in
the case that the base & member are split over multiple lines (prior to
this change the diagnostic would point to the base, not the member -
making it very unclear in chained multi-line builder-style calls)

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@183149 91177308-0d34-0410-b5e6-96231b3b80d8