[PATCH] D19429: Give backends an opportunity to finish layout post-relaxation

[Colin LeMahieu via llvm-commits]

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Overriding this function gives targets access to the layout post-relaxation and before writing fragments to output.

Hexagon is using this to more intelligently pad nops by using a larger encoding for the previous instruction if possible.

We aren't able to do this with the existing writeNopData since the previous instructions have already been encoded to the output stream.

I imagine other targets would be able to do similar optimizations and possibly more.

Repository:
  rL LLVM

http://reviews.llvm.org/D19429

Files:
  include/llvm/MC/MCAsmBackend.h
  lib/MC/MCAssembler.cpp
  lib/Target/Hexagon/MCTargetDesc/HexagonAsmBackend.cpp
  test/MC/Hexagon/align.s

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