[Nanvix] Add x86_64 toolchain support - #24
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Extend the Nanvix toolchain to support x86_64 alongside i686. Disable the red zone by default for x86_64 and apply ELF64 dynamic relocations at link time for Nanvix startup self-linking. Add the installed runtime library path and constrain default linker-script discovery to the sysroot. Teach the z script to propagate the selected target through compiler and runtime builds, sysroot staging, verification, and smoke tests. Reject libc bundles whose ELF class does not match the target. Build and test both architectures in CI and publish separate release archives. Extend Clang driver and preprocessor coverage and document the x86_64 workflow and ABI requirements.
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Summary
x86_64-nanvixtarget selection, architecture-matched sysroot staging, runtime source fallback, and ELF-class validation while preserving the i686 defaultTesting
build/bin/llvm-lit -sv clang/test/Driver/nanvix.c clang/test/Preprocessor/init-nanvix.c./z verify./z testbash -n ./zshellcheck -S warning ./zgit diff --check