[gcc/devel/rust/master] Merge #1811

[Thomas Schwinge]

https://gcc.gnu.org/g:a9422b51c1355f1414a6418e6a5ae1abdd9b9f9b

commit a9422b51c1355f1414a6418e6a5ae1abdd9b9f9b
Merge: 7f222689dcb 9b7fe56826e
Author: bors[bot] <26634292+bors[bot]@users.noreply.github.com>
Date:   Wed Feb 1 14:24:35 2023 +0000

    Merge #1811
    
    1811: Merge upstream (dummy), "Rust front-end patches v4" r=tschwinge a=tschwinge
    
    Last we did #1700 "Merge upstream, last commit before GCC/Rust upstreaming",
    which merged commit b4fddbe9592e9feb37ce567d90af822b75995531 from GCC upstream
    master branch.
    
    This one now merges the "Rust front-end patches v4", commits
    b4fddbe9592e9feb37ce567d90af822b75995531..edc676cfe8988c62c81b0df224c7fe82583012b1:
    
          - dd950cbbb97 Use DW_ATE_UTF for the Rust 'char' type
          - b772a504eff gccrs: Add necessary hooks for a Rust front-end testsuite
          - 4b8f3005af0 gccrs: Add Debug info testsuite
          - f60df7e6202 gccrs: Add link cases testsuite
          - 97705b4459b gccrs: Add general compilation test cases
          - 5a56869d6e3 gccrs: Add execution test cases
          - dc4171edb3c gccrs: Add gcc-check-target check-rust
          - 6b35ae12ce9 gccrs: Add Rust front-end base AST data structures
          - 438ae944fa6 gccrs: Add definitions of Rust Items in AST data structures
          - d588754c826 gccrs: Add full definitions of Rust AST data structures
          - 5b981e9c741 gccrs: Add Rust AST visitors
          - 18f6990f842 gccrs: Add Lexer for Rust front-end
          - 35e4f3b4af4 gccrs: Add Parser for Rust front-end pt.1
          - 32c8fb0eeaf gccrs: Add Parser for Rust front-end pt.2
          - 1841081a8a3 gccrs: Add expansion pass for the Rust front-end
          - 85a8fe00f80 gccrs: Add name resolution pass to the Rust front-end
          - 8ad1d56d68a gccrs: Add declarations for Rust HIR
          - 7641eaead40 gccrs: Add HIR definitions and visitor framework
          - 7999cf327de gccrs: Add AST to HIR lowering pass
          - b32b1b1576a gccrs: Add wrapper for make_unique
          - c7f8347e83c gccrs: Add port of FNV hash used during legacy symbol mangling
          - 15b0278905e gccrs: Add Rust ABI enum helpers
          - eb10bc5225e gccrs: Add Base62 implementation
          - 9a4fee5f57c gccrs: Add implementation of Optional
          - 2e7fc8780e0 gccrs: Add attributes checker
          - 9ce37e72062 gccrs: Add helpers mappings canonical path and lang items
          - c6c3db21769 gccrs: Add type resolution and trait solving pass
          - 24393cb68fa gccrs: Add Rust type information
          - 06688fe40a2 gccrs: Add remaining type system transformations
          - b1b35204d8a gccrs: Add unsafe checks for Rust
          - 5215235f016 gccrs: Add const checker
          - ca246e573fb gccrs: Add privacy checks
          - 520b52b24e7 gccrs: Add dead code scan on HIR
          - 4d67468d1d4 gccrs: Add unused variable scan
          - 509e4c32c6a gccrs: Add metadata output pass
          - 15f04af347e gccrs: Add base for HIR to GCC GENERIC lowering
          - 019b2f15581 gccrs: Add HIR to GCC GENERIC lowering for all nodes
          - cfbda2f78ba gccrs: Add HIR to GCC GENERIC lowering entry point
          - fe6264fa28a gccrs: These are wrappers ported from reusing gccgo
          - bba14a0790f gccrs: Add compiler driver
          - ea34614225d gccrs: Compiler proper interface kicks off the pipeline
          - ab1e0db43c2 gccrs: Add lang-spec.h
          - 5e7d199739f gccrs: Add lang.opt
          - 88415d33bb3 gccrs: Add GCC Rust front-end Make-lang.in
          - b07ef39ffbf gccrs: Add fatal_error when experimental flag is not present
          - a75f038c069 gccrs: Add config-lang.in
          - edc676cfe89 gccrs: Add README, CONTRIBUTING and compiler logo
    
    This merge is done with `git merge --strategy=ours`, so that we effectively
    don't bring any changes.  Rationale: any changes due to upstream review etc.,
    have already been applied individually to GCC/Rust master branch, and any
    remaining changes we'd either like to persist, or assess individually, later.
    
    
    Co-authored-by: Tom Tromey <tom@tromey.com>
    Co-authored-by: Philip Herron <philip.herron@embecosm.com>
    Co-authored-by: Joel Phillips <simplytheother@gmail.com>
    Co-authored-by: Arthur Cohen <arthur.cohen@embecosm.com>

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