Fix flag convention in handle count tests and comment.

BUG=505228
LOG=Y

Review URL: https://codereview.chromium.org/1210153003

Cr-Commit-Position: refs/heads/master@{#29346}

src/handles.h

@@ -226,7 +226,7 @@ class HandleScope {
 
   Isolate* isolate() { return isolate_; }
 
-  // Limit for number of handles with --check_handle-count. This is
+  // Limit for number of handles with --check-handle-count. This is
   // large enough to compile natives and pass unit tests with some
   // slack for future changes to natives.
   static const int kCheckHandleThreshold = 30 * 1024;

test/mjsunit/handle-count-ast.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --check_handle_count
+// Flags: --check-handle-count
 
 var ones = eval("[" + Array(12 * 1024).join("1,") + 1 + "]")
 

test/mjsunit/handle-count-runtime-literals.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --check_handle_count
+// Flags: --check-handle-count
 
 (function (s) {
   s.frob = function () {