AST: Respect alignment attributes on typedef'd arrays

When instantiating an array that has an alignment attribute on it, we
were looking through the array type and only considering the element
type for the resulting alignment. We need to make sure we take the
array's requirements into account too.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@206317 91177308-0d34-0410-b5e6-96231b3b80d8
Move comment back to being next to the thing it's describing.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@206320 91177308-0d34-0410-b5e6-96231b3b80d8
CodeGen: Remove a comment that isn't in the right place

This comment also appears elsewhere where it actually makes sense, and
it's just confusing here.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@206321 91177308-0d34-0410-b5e6-96231b3b80d8