[openssl/tools] 4307d5: Add a performance test for PEM_read_bio_PrivateKey()

[Matt Caswell]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/tools
  Commit: 4307d538d9f8b2f181e2324907fdba547d545858
      https://github.com/openssl/tools/commit/4307d538d9f8b2f181e2324907fdba547d545858
  Author: Matt Caswell <matt at openssl.org>
  Date:   2023-07-14 (Fri, 14 Jul 2023)

  Changed paths:
    M perf/Makefile
    A perf/pemread.c
    M perf/perflib/perfhelper.c
    M perf/perflib/perflib.h

  Log Message:
  -----------
  Add a performance test for PEM_read_bio_PrivateKey()

We repeatedly attempt to load an RSA Private Key and measure performance.

Reviewed-by: Tomas Mraz <tomas at openssl.org>
Reviewed-by: Dmitry Belyavskiy <beldmit at gmail.com>
Reviewed-by: Paul Dale <pauli at openssl.org>
(Merged from https://github.com/openssl/tools/pull/161)