[PATCHSET] Update Rust frontend 21/02/2024

[arthur.cohen@embecosm.com]

Hey everyone,

Here is the latest patchset of the Rust frontend, taken directly from our development branch.

The patches have been built, tested and bootstrapped on x86-64.

[COMMITTED 1/9] gccrs: Fix typo in RegionConstraints instance
[COMMITTED 2/9] gccrs: Add testcase for matches!() macro
[COMMITTED 3/9] gccrs: Fix rebinding imports
[COMMITTED 4/9] gccrs: expand: Fix formatting for "macro not found"
[COMMITTED 5/9] gccrs: Add testcase for #[rustc_const_stable]
[COMMITTED 6/9] gccrs: add powi intrinsics
[COMMITTED 7/9] gccrs: Fix lookup of TuplePattern sub-pattern types
[COMMITTED 8/9] gccrs: Add variadic check on function params
[COMMITTED 9/9] Update copyright years.

Best,

Arthur