Re: [heycam/webidl] Only install @@toStringTag on the prototype (#357)

@bzbarsky Regarding "performance-critical Object.prototype.toString usage", V8 has found it to be a performance bottleneck for some code, for example Angular calls it in a tight loop. This makes me think it'd be hard to gather data on (we currently don't have a way to efficiently collect usage data in optimized code). And also makes me disinclined to assume that no-one is depending on its performance on IDL objects.

The Angular case is definitely a point in favor of a branding API of some sort, but `toString` seems to be working for them for now, as long as it remains fast.

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