Having done a bunch of work on minimizing asm.js foot print, DCE is great, 
but it's only good on determining stuff known at compile time. You could 
have a function like:

if (localeFormat.isLTR) {
  formatTextLTR();
} else {
  formatTextRTL();
}

Then if you never run in an environment using RTL, you'll have the code 
included, but the branch never taken.


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