Add logic for invalidating array region to CFRefCount.cpp. When invalidating

Add logic for invalidating array region to CFRefCount.cpp. When invalidating
array region, set its default value to conjured symbol. When retrieving its
element, create new region value symbol for the element.

Also fix some 80 columns violations.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@71548 91177308-0d34-0410-b5e6-96231b3b80d8