This CL removes the optional operator flag of Float64Max and Float64Min.
Additionally it renames the instruction codes on x64 and ia32 because
the old instructions codes (e.g. SSEFloat64Max) do not match the
generated code anymore.

R=bmeurer@chromium.org

Review-Url: https://codereview.chromium.org/2237813002
Cr-Commit-Position: refs/heads/master@{#38674}