[analyze] Convert EndOfPath callback to use CheckerContext

Get rid of the EndOfPathBuilder completely.
Use the generic NodeBuilder to generate nodes.
Enqueue the end of path frontier explicitly.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@142943 91177308-0d34-0410-b5e6-96231b3b80d8
13 files changed