Matthew Pickering authored Jul 21, 2023 and Marge Bot committed Sep 26, 2024

This enables late cost centres when building profiled libraries and
subsequently greatly improves the resolution of cost centre stacks when
profiling.

This patch also introduces the `grep_prof` test modifier which is used
to apply a further filter to the .prof file before they are compared.

Fixes #21732

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Metric Increase:
    libdir
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