[Issue 22310] Template instantiation failures can be *very* costly

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22310

--- Comment #4 from Dlang Bot <dlang-bot at dlang.rocks> ---
@kinke created dlang/dmd pull request #13093 "Fix Issue 22310 - Cache failed
template instantiations" fixing this issue:

- Fix Issue 22310 - Cache failed template instantiations

  Only allow one retry attempt for gagged (speculative) instantiations,
  which seems to be crucial to make Phobos unittests compile.

https://github.com/dlang/dmd/pull/13093

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