[Interpreter] List top dispatch sources and destinations for a given Ignition bytecode.

tools/ignition/bytecode_dispatches_report_test.py

 # Copyright 2016 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import bytecode_dispatches_report as bdr
 import unittest
 
 
 class BytecodeDispatchesReportTest(unittest.TestCase):
   def test_find_top_counters(self):
@@ skipping 23 matching lines @@
     top_dispatch_sources = bdr.find_top_bytecodes({
       "a": {"a": 10, "b":  8, "c":  7},
       "b": {"a":  1, "c":  4},
       "c": {"a": 42, "b": 12, "c": 99}
     })
     self.assertListEqual(top_dispatch_sources, [
       ('c', 153),
       ('a',  25),
       ('b',   5)
     ])
+
+  def test_find_top_dispatch_sources(self):
+    top_dispatch_sources = bdr.find_top_dispatch_sources({
+      "a": {"a": 10, "b":  8, "c":  7},
+      "b": {"a":  1, "c":  4},
+      "c": {"a": 42, "b": 12, "c": 99}
+    }, "b", 10)
+    self.assertListEqual(top_dispatch_sources, [
+      ("c", 12),
+      ("a",  8)
+    ])