We have an absolute limit beyond which we don't inline small funcions as
well. The idea behind inlining small functions is that it is cheaper to
inline small functions rather than incurring the overhead due to the call.
Hence it is better not to have a hard limit on inlining small functions.
We have a limit on the number of levels of nesting to avoid really large
graphs in some corner cases.

Bug: v8:6682
Change-Id: If74f666996fe4a42bf266a4e87caabfd7c614b12
Reviewed-on: https://chromium-review.googlesource.com/648975
Commit-Queue: Mythri Alle <mythria@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48007}