Another step in the process of making the parser depend on Sema:

Another step in the process of making the parser depend on Sema:
  - move DeclSpec &c into the Sema library
  - move ParseAST into the Parse library
Reflect this change in a thousand different includes.
Reflect this change in the link orders.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@111667 91177308-0d34-0410-b5e6-96231b3b80d8