Benchmark script verification with 100 nested IFs

Summary:
This is a backport of Core PR16902 [1/3]
https://github.com/bitcoin/bitcoin/pull/16902/commits/89fb241c54fc85befacfa3703d8e21bf3b8a76eb

src/bench/verify_script.cpp was removed from BitcoinABC in https://reviews.bitcoinabc.org/rSTAGING1ff7b561eb7c6f30f1ec788e9503c30bc6485752

Test Plan: ninja all && src/bench/bitcoin-bench -filter=VerifyNestedIfScript

Reviewers: #bitcoin_abc, majcosta

Reviewed By: #bitcoin_abc, majcosta

Differential Revision: https://reviews.bitcoinabc.org/D8835