[llvm] [BOLT][RISCV] Preserve debug metadata when rewriting call pairs (PR #221116)

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Thrrreeee wrote:

> This prepended `NOP` already exists in trunk, but seems inefficient to me. Seems like in order to reorder some blocks we are introducing a 1 instruction NOP cost each time. Not sure if this matters in practise, but changing this seems like more work and I don't fully understand the implications

You are right, now I have remove this Noop instruction. https://github.com/llvm/llvm-project/pull/221965


https://github.com/llvm/llvm-project/pull/221116