[counters] Add UseCounters for 'f() = 0' syntax

include/v8.h

 // Copyright 2012 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.
 
 /** \mainpage V8 API Reference Guide
  *
  * V8 is Google's open source JavaScript engine.
  *
  * This set of documents provides reference material generated from the
  * V8 header file, include/v8.h.
@@ skipping 6470 matching lines @@
     kArrayPrototypeConstructorModified = 26,
     kArrayInstanceProtoModified = 27,
     kArrayInstanceConstructorModified = 28,
     kLegacyFunctionDeclaration = 29,
     kRegExpPrototypeSourceGetter = 30,
     kRegExpPrototypeOldFlagGetter = 31,
     kDecimalWithLeadingZeroInStrictMode = 32,
     kLegacyDateParser = 33,
     kDefineGetterOrSetterWouldThrow = 34,
     kFunctionConstructorReturnedUndefined = 35,
+    kAssigmentExpressionLHSIsCallInNonstrict = 36,

[Dan Ehrenberg, 2016/12/23 07:56:52]

Bikeshed: We use 'sloppy' all over the place to express non-strict; I think it'd
be clearer to use that here too.

[bakkot1, 2016/12/23 09:41:53]

Done.

+    kAssigmentExpressionLHSIsCallInStrict = 37,
 
     // If you add new values here, you'll also need to update Chromium's:
     // UseCounter.h, V8PerIsolateData.cpp, histograms.xml
     kUseCounterFeatureCount  // This enum value must be last.
   };
 
   enum MessageErrorLevel {
     kMessageLog = (1 << 0),
     kMessageDebug = (1 << 1),
     kMessageInfo = (1 << 2),
@@ skipping 3247 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // INCLUDE_V8_H_