[analyzer] Fix FieldRegion dumps.

The '->' thing has always been confusing; the actual operation '->'
translates to a pointer dereference together with adding a FieldRegion,
but FieldRegion on its own doesn't imply an additional pointer
dereference.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@375281 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed