Rework ExprEngine::processCFGBlockEntrance()
to use a node builder.  This paves the way
for Checkers to interpose (via a "visit" method)
at the entrance to blocks.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@123217 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed