Martin Hořeňovský ec59cd8736 Support decomposing types that only compare with literal 0 ...

This is primarily done to support new `std::*_ordering` types,
but the refactoring also supports any other type with this
property.

The compilation overhead is surprisingly low. Testing it with
clang on a Linux machine, compiling our SelfTest project takes
only 2-3% longer with these changes than it takes otherwise.

Closes #2555

2022-11-04 19:24:44 +01:00

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