Various additions to ASTMatcher library:
    
New type matchers:
* recordType
* elaboratedType

New narrowing matchers:
* hasQualifier
* namesType
* hasDeclContext

Added tests and updated LibASTMatchersReference.

Reviewers: klimek


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@176047 91177308-0d34-0410-b5e6-96231b3b80d8