fix: AtomicI64, AtomicU64 for build mipsel processor

[TGLuong]

Changes

Use atomic_shim for mipsel processor. Because when build for mipsel architecture, it don't have AtomicI64, AtomicU64 in std.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[linux-foundation-easycla]

• ✅login: TGLuong / (9ecf834)
• ✅login: TGLuong / (9ecf834, 44eca8c)
• ✅login: TGLuong / (9ecf834, 44eca8c, f86b47e)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.3%. Comparing base (b24bb9c) to head (f86b47e).

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2054   +/-   ##
=====================================
  Coverage   77.3%   77.3%           
=====================================
  Files        124     124           
  Lines      21282   21282           
=====================================
  Hits       16472   16472           
  Misses      4810    4810           

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[lalitb]

Thanks for the PR. Couple of comments for now:

1. any reason for using atomic_shim instead of portable-atomic ? Haven't used either of them, but from the stats (number of downloads and dependents), the later seems to be more widely used.
2. Can we include this crate only when compiling for MIPS (and possibly PowerPC), as done here - https://github.com/esp-rs/rust/blob/1b259e0b8b2129dd3d62819a32f6d9b287e6b86c/compiler/rustc_data_structures/Cargo.toml#L50

[TGLuong]

Thanks for the PR. Couple of comments for now:

1. any reason for using atomic_shim instead of portable-atomic ? Haven't used either of them, but from the stats (number of downloads and dependents), the later seems to be more widely used.
2. Can we include this crate only when compiling for MIPS (and possibly PowerPC), as done here - https://github.com/esp-rs/rust/blob/1b259e0b8b2129dd3d62819a32f6d9b287e6b86c/compiler/rustc_data_structures/Cargo.toml#L50

Hi @lalitb, thanks for your comments:

1. I search for Atomic library and only seen atomic_shim. I just have check portable-atomic and it seem to be better.
2. Let me change to use this crate only for MIPS and PowerPC