Microsoft Record Layout: zero sized base after base with vbtbl fix

Microsoft adds an extra byte of padding before laying out zero sized 
non-virtual bases if the non-virtual base before it contains a vbptr.  
This patch adds the same behavior to clang.

Differential Revision: http://llvm-reviews.chandlerc.com/D2106



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@195158 91177308-0d34-0410-b5e6-96231b3b80d8
Switching some string literals to be generated by the AttributeList object itself.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@195160 91177308-0d34-0410-b5e6-96231b3b80d8
PR9547: If we're parsing a simple-declaration that contains a tag definition,
and we see an ill-formed declarator that would probably be well-formed if the
tag definition were just missing a semicolon, use that as the diagnostic
instead of producing some other mysterious error.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@195163 91177308-0d34-0410-b5e6-96231b3b80d8