Revert^2 "Increase threshold for profile compilation"

Increase threshold for profile compilation

Threshold to trigger compilation based on profiles has been increase
to avoid re-compilation too frequenctly.
Now compilation will take place if methods/classes in the new profile exceeds
by maximum of the following:
- 2% methods/classes in the existing profile.
- 100 methods or 50 classes.

Context for above numbers:
I analyzed profiles on my local device. Average number of methods and classes
in the profiles were 8000 and 2500 respectively.

Also added tests for the same.

Bug: 66732454
Test: test-art-[host|target]-gtest-profile_assistant_test
This reverts commit a660171d.

Change-Id: I5c5f8d76a32900c42cda21052636a8588d28e521