TEST=cctest/test-run-machops/Float(64|32)MaxP, Float(64|32)MinP,
       unittests/InstructionSelectorTest.Float64Min|Max
BUG=v8:4206
LOG=N

Review URL: https://codereview.chromium.org/1419753008

Cr-Commit-Position: refs/heads/master@{#31806}