Refactor ABIArgInfo::Expand implementation (NFC).

Hoist the logic which determines the way QualType is expanded
into a separate method. Remove a bunch of copy-paste and simplify
getTypesFromArgs() / ExpandTypeFromArgs() / ExpandTypeToArgs() methods.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@218615 91177308-0d34-0410-b5e6-96231b3b80d8
Refactor Matcher<T> and DynTypedMatcher to reduce overhead of casts.

Summary:
This change introduces DynMatcherInterface and changes the internal
representation of DynTypedMatcher and Matcher<T> to use a generic
interface instead.
It removes unnecessary indirections and virtual function calls when
converting matchers by implicit and dynamic casts.
DynTypedMatcher now remembers the stricter type in the chain of casts
and checks it before calling into DynMatcherInterface.
This change improves our clang-tidy related benchmark by ~14%.
Also, it opens the door for more optimizations of this kind that are
coming in future changes.

As a side effect of removing these template instantiations, it also
speeds up compilation of Dynamic/Registry.cpp by ~17% and reduces the number of
symbols generated by ~30%.

Reviewers: klimek

Subscribers: klimek, cfe-commits

Differential Revision: http://reviews.llvm.org/D5485

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@218616 91177308-0d34-0410-b5e6-96231b3b80d8