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Allow building for hard-float targets in RISC-V #65024

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Description

Currently Rust does not support compiling/linking with LLVM's -target-abi=lp64d option, which enables the hard-float ABI in riscv64.

This feature is necessary for Rust interop with C code on hard-float targets.

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    A-crossArea: Cross compilationC-feature-requestCategory: A feature request, i.e: not implemented / a PR.O-riscvTarget: RISC-V architectureT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.

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