[analyzer;alternate arrows] Rename 'adjustBranchEdges' to 'splitBranchConditionEdges'.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@182986 91177308-0d34-0410-b5e6-96231b3b80d8
[analyzer; new edges] in splitBranchConditionEdges() do not check that predecessor edge has source in the same lexical scope as the target branch.

Fixes <rdar://problem/14031292>.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@182987 91177308-0d34-0410-b5e6-96231b3b80d8