[analyzer] Remove StmtNodeBuilder from CheckerContext

It now only depends on a generic NodeBuilder instead. As part of this change, make the generic node builder results finalized by default.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@142452 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed