Some optimizations for ThreadHandler.

- CreateStackTrace() now takes a parameter indicating whether or not
  to try and retrieve full frame information. This in turn is passed
  on to SpecificImageDebugInfo, where e.g. DwarfImageDebugInfo can
  use it to avoid constructing variables and parameters. This is
  used by ThreadHandler since, when it requests the top frame for
  its stepping  calculations, this additional data/work is completely
  unnecessary.

src/apps/debugger/controllers/ThreadHandler.cpp

@@ -253,7 +253,8 @@ ThreadHandler::HandleThreadAction(uint32 action)
 
 	if (stackTrace == NULL && cpuState != NULL) {
 		if (fDebuggerInterface->GetArchitecture()->CreateStackTrace(
-				fThread->GetTeam(), this, cpuState, stackTrace, 1) == B_OK) {
+				fThread->GetTeam(), this, cpuState, stackTrace, 1, false,
+				false) == B_OK) {
 			stackTraceReference.SetTo(stackTrace, true);
 		}
 	}