In the current implementation the decision to inline polymorphic function
calls applies to all functions. Either we inline all of them or none of
them. Also, we decide to inline if the size of one of function is less
than the FLAG_max_inlined_nodes.

This cl changes it to a decision on individual functions. In the case of
polymorphic calls, we might inline some of the functions and not inline
others.

Bug: 
Change-Id: I2f4049b5e55445b4858b260d289c96090c6aaa74
Reviewed-on: https://chromium-review.googlesource.com/508668
Commit-Queue: Mythri Alle <mythria@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45428}