MethodStatistics: Use const references in API

Use transparent comparator for efficiency

Test: simpleperf using Oboetester
Bug: 238654698
Merged-In: Ie1d0f66094ac5b54ff35649b7f1971fb4eb87465
Change-Id: Ie1d0f66094ac5b54ff35649b7f1971fb4eb87465
2 files changed