[Bug c++/125329] Compilation performance of C++ reflection slower with `import std;` than with header inclusion

[ppalka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125329
Bug 125329 depends on bug 125334, which changed state.

Bug 125334 Summary: [16/17 Regression] basic std module example compile time doubles when <bits/stdc++.h> is built as header unit
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125334

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED