PlistDiagnostics: force the ranges for control-flow edges to be single locations, forcing
adjacent edges to have compatible ranges.  This simplifies the layout logic for some clients.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@158028 91177308-0d34-0410-b5e6-96231b3b80d8
7 files changed