Record doomed loops iff COUNT_LOOPS defined

When COUNT_LOOPS is not defined, stop earlier to avoid wasting time
finding a loop we won't be able to record.
When COUNT_LOOPS is defined, don't stop at all, so we can count all the
loops.

src/jit/optimizer.cpp

@@ -2409,11 +2409,9 @@ void Compiler::optFindNaturalLoops()
         if (search.findLoop(head))
         {
             // Found a loop; record it and see if we've hit the limit.
-            if (!search.recordLoop())
-            {
-                // We hit the limit.
-                break;
-            }
+            bool recordedLoop = search.recordLoop();
+
+            (recordedLoop); // avoid unusued variable warnings in COUNT_LOOPS and !DEBUG
 
 #if COUNT_LOOPS
             if (!hasMethodLoops)
@@ -2429,6 +2427,13 @@ void Compiler::optFindNaturalLoops()
 
             /* keep track of the number of exits */
             loopExitCountTable.record(static_cast<unsigned>(exitCount));
+#else  // COUNT_LOOPS
+            assert(recordedLoop);
+            if (optLoopCount == MAX_LOOP_NUM)
+            {
+                // We won't be able to record any more loops, so stop looking.
+                break;
+            }
 #endif // COUNT_LOOPS
         }
     }