Add typedefNameDecl() and typeAliasDecl() to the AST matchers; improves hasType() to match on TypedefNameDecl nodes.

Patch by Clement Courbet.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@266331 91177308-0d34-0410-b5e6-96231b3b80d8