Apply comment to HTML5 key event 'which' field to help developers not shy away from it, since it currently has the best cross-browser support. Fixes #2817.
document more js library stuff
Fix NaN and -0.0 aware _mm_min_ps and _mm_max_ps implementations, due to a typo, max was min and vice versa.
do not track eliminatable variables from inside a switch to outside
Asm.js validation for SIMD