Transport asm.js correctly

[shicks]

Peephole passes and others should not traverse into functions annotated with 'use asm'. The 'use asm' string needs to be retained.

[MatrixFrog]

It seems rather strange to me, to use both asm.js and Closure Compiler on the same code. But I have heard that some people do it, so I guess we could do this.

[L3P3]

Is there any progress on this? Would be very nice to have asm.js in very hot functions without closure compiler ripping it apart into normal js code.

[L3P3]

I have not much knowledge how closure-compiler works but I assume that it would be enough to just fall back to white-space only (and maybe variable renaming) inside of blocks that have "use-asm"; at their beginning. Is that somewhat easy to implement? I have code where hot loops were converted to asm code, like you would do it in c projects with inline assembly.

[L3P3]

The "only" thing really needed is that a function with "use asm" at its beginning is just handled like a text, so that if not making it smaller, it is at least preserved 1:1 instead of loosing its performance gains...