Based on quick read of C++ specs (although more thorough reading of C++ 
specs would be required), 
(1) std::chrono::high_resolution_clock::now is declared to be 
no-except(cannot throw exceptions). 
(2) high_resolution_-clock may be a synonym for system_clock or steady_clock

When calling this function in Safari ASM.JS worker(Mac), 
The test program is same as:
https://github.com/kripken/emscripten/issues/2980
It's just that this asm.js is loaded from javascript webworker.

Function *__ZNSt3__16chrono12steady_clock3nowE *calls 
*__ZNSt3__120__throw_system_errorEiPKc 
(via *invoke_vii).
Shouldn't emscripten fallback to Date.now() if Performance.now() is not 
implemented ?

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