Fix various memory leaks in unit tests detected by a new version of ASAN.

runtime/vm/compiler_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/assert.h"
 #include "vm/class_finalizer.h"
 #include "vm/code_patcher.h"
 #include "vm/compiler.h"
 #include "vm/dart_api_impl.h"
 #include "vm/object.h"
@@ skipping 84 matching lines @@
   EXPECT(!func.HasOptimizedCode());
 #if !defined(PRODUCT)
   // Constant in product mode.
   FLAG_background_compilation = true;
 #endif
   BackgroundCompiler::EnsureInit(thread);
   Isolate* isolate = thread->isolate();
   ASSERT(isolate->background_compiler() != NULL);
   isolate->background_compiler()->CompileOptimized(func);
   Monitor* m = new Monitor();
-  MonitorLocker ml(m);
-  while (!func.HasOptimizedCode()) {
-    ml.WaitWithSafepointCheck(thread, 1);
+  {
+    MonitorLocker ml(m);
+    while (!func.HasOptimizedCode()) {
+      ml.WaitWithSafepointCheck(thread, 1);
+    }
   }
+  delete m;
   BackgroundCompiler::Stop(isolate);
 }
 
 
 TEST_CASE(RegenerateAllocStubs) {
   const char* kScriptChars =
       "class A {\n"
       "}\n"
       "unOpt() => new A(); \n"
       "optIt() => new A(); \n"
@@ skipping 99 matching lines @@
   EXPECT(val.IsInteger());
   EXPECT_EQ(7, Integer::Cast(val).AsInt64Value());
 
   intptr_t final_class_table_size =
       Isolate::Current()->class_table()->NumCids();
   // Eval should not eat into this non-renewable resource.
   EXPECT_EQ(initial_class_table_size, final_class_table_size);
 }
 
 }  // namespace dart