[PATCH Rust front-end v2 02/37] gccrs: Add nessecary hooks for a Rust front-end testsuite

[Mike Stump]

Ok.

> On Aug 24, 2022, at 4:59 AM, herron.philip@googlemail.com wrote:
> 
> From: Philip Herron <philip.herron@embecosm.com>
> 
> This copy's over code from other front-end testsuites to enable testing
> for the rust front-end specifically.
> 
> Co-authored-by: Marc Poulhiès <dkm@kataplop.net>
> Co-authored-by: Thomas Schwinge <thomas@codesourcery.com>
> ---
> gcc/testsuite/lib/rust-dg.exp |  49 +++++++++
> gcc/testsuite/lib/rust.exp    | 186 ++++++++++++++++++++++++++++++++++