Reduce the deopt table size by reusing the entry address available in a temp
register to compute the entry id. Saves ~200kB.

Bug: 
Change-Id: I3a1baf0e4c8cf19a0aa149da2bea623c1349a9ca
Reviewed-on: https://chromium-review.googlesource.com/774890Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49549}