This reverts commit 48cee973.

Reason for revert: Including size of parent function in the inlining budget does not allow even small functions to be inlined into large functions. This causes regressions on some benchmarks: https://bugs.chromium.org/p/chromium/issues/detail?id=747247  

Bug:747247

Original change's description:
> [Turbofan] Include size of parent function in inlining decisions.
> 
> The size of parent function is not considered when taking decisions
> on which functions to inline. This cl, includes the size of the
> parent function to the cumulative count. 
> 
> Bug: 
> Change-Id: Ib8f4ec684f8313f7c2e29237580bb3c0403930bd
> Reviewed-on: https://chromium-review.googlesource.com/506205
> Commit-Queue: Mythri Alle <mythria@chromium.org>
> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#46789}

TBR=mstarzinger@chromium.org,mythria@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: Ic8a5282f4f41474dc1608044a81920cdd794437d
Reviewed-on: https://chromium-review.googlesource.com/609780Reviewed-by: Mythri Alle <mythria@chromium.org>
Commit-Queue: Mythri Alle <mythria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47270}