[PATCH] D125036: [LLD][RISCV] Alignment relaxation

[Greg McGary via Phabricator via llvm-commits]

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This is the first in a stack of diffs that repackages and revises D100835 <https://reviews.llvm.org/D100835> for RISC-V linker relaxation.

This diff implements machinery to elide unwanted instruction bytes, and to rewrite NOP sequences that are optimal for code alignment padding.

Caveat: this has not been tested with options `--emit-relocs` or `--relocatable`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D125036

Files:
  lld/ELF/Arch/RISCV.cpp
  lld/ELF/InputSection.cpp
  lld/ELF/InputSection.h
  lld/ELF/Relocations.cpp
  lld/ELF/Relocations.h
  lld/ELF/Target.h
  lld/ELF/Writer.cpp
  lld/test/ELF/riscv-relax-align-rvc.s
  lld/test/ELF/riscv-relax-align.s
  lld/test/ELF/riscv-reloc-align.s

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