ffi: add fast support for almost all other platforms#63941
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Signed-off-by: Paolo Insogna <paolo@cowtech.it>
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This extends the experimental Fast FFI path to the remaining 64-bit Node.js architectures with conservative ABI-specific trampolines.
The change adds scalar, register-only Fast FFI emitters for:
The new emitters intentionally reject unsupported ABI shapes so calls fall back to SharedBuffer or generic libffi. Current fallback cases include buffer-shaped arguments on the new scalar-only emitters, stack-passed arguments, narrow returns where not yet normalized, 32-bit platforms, and AIX/PPC64BE.
s390x support is included for builds where FFI is available, such as
--shared-ffi, since bundled FFI is not currently enabled for that target.The contributor docs were updated to describe the supported platform matrix, per-ABI limits, and explicitly note that 32-bit platforms and AIX/PPC64BE remain out of scope.
Assisted-By: OpenAI:GPT-5.5 <openai/gpt-5.5>