Now, I understand how to call foldsTo function.

But I can't still fix this 
bug(https://bugzilla.mozilla.org/show_bug.cgi?id=852791)
When I type:
var s = "hoge" + x + "fuga"
,ValueNumberer::simplify or ValueNumberer::simplifyControlInstruction always 
call MDefinition::foldsTo(bool useValueNumbers).

I predict MStringLength::foldsTo is called when string constants is folded.
But MStringLength::foldsTo isn't call.

What function call when string constants is folded.
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