Add the needed base for new mrustc compiler.
https://github.com/thepowersgang/mrustc

mrustc is transpiling Rust to C and is mainly used for bootstraping rustc.

This change treats the C output as the final product (as is assembly for
GCC/clang). It is not easily possible to automatically plug this C to other C
compilers to get assembly or executable.

fixes compiler-explorer#2643

mattgodbolt pushed a commit that referenced this pull request

Add the needed base for new mrustc compiler.
https://github.com/thepowersgang/mrustc

mrustc is transpiling Rust to C and is mainly used for bootstraping rustc.

This change treats the C output as the final product (as is assembly for
GCC/clang). It is not easily possible to automatically plug this C to other C
compilers to get assembly or executable.

fixes #2643

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