[analyzer] Ivar invalidation: track ivars declared in categories.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172168 91177308-0d34-0410-b5e6-96231b3b80d8
[analyzer]Recognize ivar invalidation protocol even if it was redeclared

This will get rid of some false positives as well as false negatives.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172169 91177308-0d34-0410-b5e6-96231b3b80d8
[analyzer] Rename the warning: state the issue before the hint of how it
can be fixed

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172170 91177308-0d34-0410-b5e6-96231b3b80d8