[llvm] [RISCV] Track Linker Relaxable through Assembly Relaxation (PR #152602)

[Sam Elliott via llvm-commits]

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+# RUN: llvm-mc --triple=riscv32 -mattr=+relax,+experimental-xqcilb,+experimental-xqcibi \
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lenary wrote:

Done

https://github.com/llvm/llvm-project/pull/152602