Support s390 #106
Description
IBM Z / LinuxONE is supported by Red Hat and Ubuntu, which means we should eventually support the s390x architecture.
Linux s390 targets with official Ubuntu binutils etc. support:
Linux arch QEMU target LLVM target Ubuntu binutils Example Rust triple
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s390 s390x-softmmu SystemZ binutils-s390x-linux-gnu s390x-unknown-linux-gnu