- Orders machine representations so it's easier to check for floating
point.
- Orders operand types so it's easier to check for LocationOperands.
- Adds IsLocation, IsFPLocation predicates.

LOG=N
BUG=v8:4124

Review-Url: https://codereview.chromium.org/2382013003
Cr-Commit-Position: refs/heads/master@{#39941}