Add Duration from nanos u128

[omanirudh]

What does this PR do?

This draft PR adds the Duration::from_nanos_u128 function to handle durations that exceed the range of u64, allowing for time spans greater than ~584 years.

Motivation

The current Duration API does not support creating durations from nanoseconds represented as u128. This addition addresses that limitation.

Tracking Issue

Fixes #139201

Details

• Introduced Duration::from_nanos_u128 as a const fn similar to other functions in the file.

• Ensured safety by validating the nanoseconds before using unsafe code.

• To do : complete the documentation and examples for the new function.

  r? @RalfJung

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r? @tgross35

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[RalfJung]

Thanks for taking this over!
However, this needs a libs reviewer. I just proposed the API. :)

r? libs

[omanirudh]

Thanks for taking this over! However, this needs a libs reviewer. I just proposed the API. :)

r? libs

Happy to take this up. noted.

[tgross35]

@rustbot author

[rustbot]

Reminder, once the PR becomes ready for a review, use @rustbot ready.

[rustbot]

Some changes occurred in compiler/rustc_attr_parsing

cc @jdonszelmann

Some changes occurred in exhaustiveness checking

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Some changes occurred in coverage instrumentation.

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cc @RalfJung, @oli-obk, @lcnr

These commits modify the library/Cargo.lock file. Unintentional changes to library/Cargo.lock can be introduced when switching branches and rebasing PRs.

If this was unintentional then you should revert the changes before this PR is merged.
Otherwise, you can ignore this comment.

Some changes occurred in match lowering

cc @Nadrieril

Some changes occurred in compiler/rustc_codegen_llvm/src/builder/autodiff.rs

cc @ZuseZ4

Some changes occurred in compiler/rustc_passes/src/check_attr.rs

cc @jdonszelmann

Some changes occurred to the CTFE / Miri interpreter

cc @rust-lang/miri

Some changes occurred in compiler/rustc_codegen_gcc

cc @antoyo, @GuillaumeGomez

rustc_macros::diagnostics was changed

cc @davidtwco, @compiler-errors, @TaKO8Ki

Some changes occurred in compiler/rustc_builtin_macros/src/autodiff.rs

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cc @rust-lang/wg-mir-opt

changes to the core type system

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Some changes occurred in compiler/rustc_sanitizers

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These commits modify compiler targets.
(See the Target Tier Policy.)

HIR ty lowering was modified

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Some changes occurred in compiler/rustc_codegen_cranelift

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Some changes occurred in compiler/rustc_attr_data_structures

cc @jdonszelmann

Some changes occurred to the core trait solver

cc @rust-lang/initiative-trait-system-refactor

Some changes occurred to the intrinsics. Make sure the CTFE / Miri interpreter
gets adapted for the changes, if necessary.

cc @rust-lang/miri, @RalfJung, @oli-obk, @lcnr

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• The following commits have merge commits (commits with multiple parents) in your changes. We have a no merge policy so these commits will need to be removed for this pull request to be merged.

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  You can start a rebase with the following commands:

  $ # rebase
  $ git pull --rebase https://github.com/rust-lang/rust.git master
  $ git push --force-with-lease
  

• This PR is based on an upstream commit that is 69 days old.

  It's recommended to update your branch according to the rustc-dev-guide.

[tgross35]

@omanirudh it looks like you wound up with bad commit history somehow. You should be able to fix this by rebasing your branch, check out https://rustc-dev-guide.rust-lang.org/git.html#rebasing

[omanirudh]

Re-triggering CI after rebase.
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[tgross35]

It looks like you did a merge rather than a rebase - that will need to get fixed since this branch still contains some weird history. Were you able to try what was suggested in rustc-dev-guide (linked above)?