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Auto merge of #103836 - H4x5:extra-float-constants, r=thomcc
Add additional float constants
Initial implementation of this ACP: https://github.com/rust-lang/libs-team/issues/119. [Accepted]
Tracking issue: #103883
The values for the constants are copied from the [`libstdc++` source code](https://github.com/gcc-mirror/gcc/blob/16e2427f50c208dfe07d07f18009969502c25dc8/libstdc%2B%2B-v3/include/std/numbers#L57-L120).
