[libFuzzer] Remove lazy counters.

Summary: Lazy counters haven't improved performance for large fuzz targets.

Reviewers: kcc

Reviewed By: kcc

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D67476

llvm-svn: 373403
GitOrigin-RevId: 1c8e05110c01254fc26ca3db90e9d8518957d815
10 files changed