o Adds wide variants of bytecodes that have operands describing ranges
  of registers. The upcoming wide register support does not suppport
  re-mapping ranges.
o Adds kRegPair16 and kRegTriple16 operands required for new wide
  bytecodes and renames Count8/Count16 operands to RegCount8/RegCount16.
o Removes Exchange bytecodes

BUG=v8:4675
LOG=NO

Review URL: https://codereview.chromium.org/1595103006

Cr-Commit-Position: refs/heads/master@{#33389}