Stabilize fN::BITS

[Apersoma]

Tracking issue: #151073
Closes: #151073

[rustbot]

r? @scottmcm

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The reviewer was selected based on:

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[rustbot]

compiler-builtins is developed in its own repository. If possible, consider making this change to rust-lang/compiler-builtins instead.

cc @tgross35

[tgross35]

This has only been around since January but it seems pretty unobjectionable to have. However, this does conflict with a constant in use in the ecosystem (showed up in the implementation PR) so we need to take a look at crater.

@bors try

@rustbot label +I-libs-api-nominated

[rust-bors]

☀️ Try build successful (CI)
Build commit: 0abe69e (0abe69e6c16114311cc2700e972492e64d69c28f, parent: 1f7f8ea0721a3b1eb73e6c6d25cccb371434b320)

[tgross35]

Doing a run with tests in case somebody has a different value for BITS for some reason.

@craterbot run mode=build-and-test

[craterbot]

👌 Experiment pr-154065 created and queued.
🤖 Automatically detected try build 0abe69e
🔍 You can check out the queue and this experiment's details.

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