Move NullDeref and UndefDeref into their own checker. 
Add a CheckLocation() interface to Checker.
Now ImplicitNullDeref nodes are cached in NullDerefChecker.
More cleanups follow.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@85471 91177308-0d34-0410-b5e6-96231b3b80d8
8 files changed