dmd codegen improvements

[Ola Fosheim Grostad via Digitalmars-d]

On Thursday, 3 September 2015 at 22:53:01 UTC, deadalnix wrote:
> asm.js typically runs half the speed of natively compiled code. 
> pNaCl run about 20% slower typically.

Browser version, benchmark, reference?

Without informationloss there is no inherent overhead outside 
sandboxing if you avoid the sandbox boundaries.

Other people report 1-1.5x.