[libc++] Restore __synth_three_way
lambda
#90398
Draft
+11
−27
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Restore
__synth_three_way
lambda to match the Standard.GH-57222 is done, restoring the Standard wording implementation should be possible.
https://github.com/llvm/llvm-project/blob/df28d4412c1d21b0e18896c92ac77d2fac7729f1/libcxx/include/__compare/synth_three_way.h#L28
According to comment #59513 (comment), GH-59513 is not a blocker.