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5a8887b0c0
This commit adds CI for a few more targets: * i686-unknown-linux-gnu * arm-unknown-linux-gnueabihf * armv7-unknown-linux-gnueabihf * aarch64-unknown-linux-gnu The CI here is structured around using a Docker container to set up a test environment and then QEMU is used to actually execute code from these platforms. QEMU's emulation actually makes it so we can continue to just use `cargo test`, as processes can be spawned from QEMU like `objdump` and files can be read (for libbacktrace). Ends up being a relatively seamless experience! Note that a number of intrinsics were disabled on i686 because they were failing tests, and otherwise a few ARM touch-ups were made to get tests passing.