[Bug libstdc++/106852] Implement C++23 P2465R3 Standard Library Modules std and std.compat

[ppalka at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106852
Bug 106852 depends on bug 106848, which changed state.

Bug 106848 Summary: ICE when compiling module interface file with -g: error: 
type variant differs by TYPE_MAX_VALUE
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106848

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