FixIt: use getLocForEndOfToken to insert fix-it after a type name.

Instead of setting DeclSpec's range end to point to the next token
after the DeclSpec, we use getLocForEndOfToken to insert fix-it after a type
name.

Before this fix, fix-it will change
^(NSView view) to ^(*NSView view)

This commit correctly updates the source to ^(NSView* view).

rdar://21042144
Differential Revision: http://reviews.llvm.org/D20844

llvm-svn: 271448