[Bug 2027942] Re: Upgrade Rust to 1.71.0

[Zixing Liu]

Lintian output for 1.71:

E: rustc source: field-too-long Vendored-Sources-Rust (11087 chars > 5000)
W: rustc source: mismatched-override missing-license-paragraph-in-dep5-copyright debian/copyright mpl-2.0+ [debian/source/lintian-overrides:15]
W: rustc source: missing-license-paragraph-in-dep5-copyright mpl-2.0+ [debian/copyright:2042]
W: rustc source: unknown-field Vendored-Sources-Rust
N: 0 hints overridden; 1 unused override
N: Some overrides were ignored.
N: Use --verbose for more information.
Finished running lintian.

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Title:
  Upgrade Rust to 1.71.0

Status in rustc package in Ubuntu:
  In Progress

Bug description:
  Upgrade Rust to 1.71.0.

  Notable changes from upstream:

  * Added `*-unwind` ABI suffixes. This allows unwinding across the language boundaries (maybe useful for C++ exceptions).
  * Added `#[debug_visualizer]` attribute macro for customizing debugger helper scripts. Now you can replace Rust's default debugger helper script with yours.
  * Thread local variables can be constant-evaluated during the compile time.
  * Default LLVM version is now 16.
  * Added support for LoongArch* CPU architecture in the compiler (needs LLVM >= 16) and standard library (Tier 3 as of writing).
  * Many Microsoft(R) Windows(R) related changes (not applicable to Ubuntu).

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