PPC: Vector-ICs - speed towards the monomorphic exit as quickly as possible.

PPC: Vector-ICs - speed towards the monomorphic exit as quickly as possible.

Port 35a67b745d862c5b1f584c2786ebf1369dc4f1ff

Original commit message:
Thanks to some careful assumptions, we can examine the object found at
vector[slot] and trust it's a heap object where the second field is
either a map if it's a WeakCell, or definitely not a map if it's a
Symbol, String or FixedArray. Use this to save a memory read.

R=mbrandy@us.ibm.com

BUG=

Review URL: https://codereview.chromium.org/1059133005

Cr-Commit-Position: refs/heads/master@{#27728}