472bc90323
Patch #19786 removed an exception, which caused many more CI jobs to run
`memanalyze.pl`. It resulted in a 10-30% (Linux), 15% (macOS), 100% (2x,
on Windows) slowdown of runtest steps. It also made some jobs exceed
their time limits and fail (seen with the Windows ARM64 job.)
Turns out the overhead was caused by calling `memanalyze.pl` as
an external process (twice per test), which in turn had to load a full
Perl stack from scratch each time.
Fix by converting memanalyze to a Perl modul, loaded as part of
`runtests.pl`, which eliminated the overhead completely.
It also sped up existing jobs where memanalyze was run for a long time,
e.g. two c-ares Windows jobs, saving 4.5m per CI run.
Supersedes #19819
Bug: https://github.com/curl/curl/pull/19786#issuecomment-3598679397
Follow-up to fb7033d760 #19786
Closes #19821
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