[analyzer][NFC] Be more descriptive when we replay without inlining

[isuckatcs]

Summary

This patch adds a ProgramPointTag to the EpsilonPoint created
before we replay a call without inlining.

As a result, the exploded node turns from this:

to this:

clang/lib/StaticAnalyzer/Core/ExprEngine.cpp

bool ExprEngine::replayWithoutInlining(ExplodedNode *N,
 
   if (!BeforeProcessingCall)
     return false;
 
   // TODO: Clean up the unneeded nodes.
 
   // Build an Epsilon node from which we will restart the analyzes.
   // Note that CE is permitted to be NULL!
-  ProgramPoint NewNodeLoc =
-               EpsilonPoint(BeforeProcessingCall->getLocationContext(), CE);
+  static SimpleProgramPointTag PT("ExprEngine", "Replay without inlining");
+  ProgramPoint NewNodeLoc = EpsilonPoint(
+      BeforeProcessingCall->getLocationContext(), CE, nullptr, &PT);
   // Add the special flag to GDM to signal retrying with no inlining.
   // Note, changing the state ensures that we are not going to cache out.
   ProgramStateRef NewNodeState = BeforeProcessingCall->getState();
   NewNodeState =
     NewNodeState->set<ReplayWithoutInlining>(const_cast<Stmt *>(CE));
 
   // Make the new node a successor of BeforeProcessingCall.
   bool IsNew = false;