Add floor, ceil, round (truncate) instructions for ia32, x64 (if SSE4.1) and
add floor, ceil, round (truncate and away from zero) for arm64.
R=bmeurer@chromium.org, dcarney@chromium.org, mstarzinger@chromium.org, rodolph.perfetta@arm.com
TEST=test/mjsunit/asm/math-floor.js,test/mjsunit/asm/math-ceil.js,test/unittest/compiler/js-builtin-reducer-unittest.cc
Review URL: https://codereview.chromium.org/
677433002
Cr-Commit-Position: refs/heads/master@{#25018}
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@25018
ce2b1a6d-e550-0410-aec6-
3dcde31c8c00