LGTM as a first step, too, but I think this should have Crankshaft support.
https://codereview.chromium.org/169783002/diff/130001/src/harmony-math.js
File src/harmony-math.js (right):
https://codereview.chromium.org/169783002/diff/130001/src/harmony-math.js#newcode157
src/harmony-math.js:157: function MathClz32(x) {
What TC39 seems to intend is basically exposing some form of intrinsics
for processor intstructions. AFAICT "count leading zeroes" has HW
support for all our platforms and boils down to a single CPU
instructions, and I think this is the expectation of people using such
intrinsics. Therefore we should add Crankshaft support, which shouldn't
be too hard.
https://codereview.chromium.org/169783002/
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