first wave of fixes for @encode sema support.  This is part of PR3648.

The big difference here is that (like string literal) @encode has 
array type, not pointer type.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@65391 91177308-0d34-0410-b5e6-96231b3b80d8
12 files changed