[libclang] Provide location for attributes and expose 'packed' attribute.

Patch by Loïc Jaquemet!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191345 91177308-0d34-0410-b5e6-96231b3b80d8
[libclang] python: fix return type of clang_Type_getSizeOf().

Patch by Loïc Jaquemet!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@191346 91177308-0d34-0410-b5e6-96231b3b80d8