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Re:Asm.js in Firefox Nightly by EwanToo on Friday March 22, 2013 @06:09AM (#5422102)
From the asm FAQ, it seems like GC will happen:

Q. Can asm.js serve as a VM for managed languages, like the JVM or CLR? A. Right now, asm.js has no direct access to garbage-collected data; an asm.js program can only interact indirectly with external data via numeric handles. In future versions we intend to introduce garbage collection and structured data based on the ES6 structured binary data API, which will make asm.js an even better target for managed languages.

Re:Asm.js in Firefox Nightly by stormbrew on Friday March 22, 2013 @09:08AM (#5422646)
I took that to be actually talking about the other way around -- accessing JS GC'd objects from the asm.js code's heap and having it work correctly (which is currently onerous). I don't think that helps implement GC of the asm.js heap.