rustc can use different backend and this new script builds all the needed parts
to have GCC as the code generator.

It needs (at the moment) a patched version of GCC and builds it with libjit support.
Some glue code (in Rust) is added in the mix to finally be able to use the rustc
compiler with this dynamic backend.

Fixes compiler-explorer/compiler-explorer#2683

dkm marked this pull request as ready for review

dkm mentioned this pull request

dkm deleted the pr/rustc_codegen_gcc branch

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