[PATCH] D130521: [BOLT] Generate sections for multiple fragments

[Fabian Parzefall via Phabricator via llvm-commits]

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This patch adds support to generate any number of sections that are
assigned to fragments of functions that are split more than two-way.
With this, a function's *nth* split fragment goes into section
`.text.cold.n`.

This also changes `FunctionLayout::erase` to make sure, that there are
no empty fragments within the split fragments. This takes away some
flexibility in assigning fragments, but is currently necessary to avoid
generating symbols for empty split fragments and keeping emission
consistent with the old behavior.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D130521

Files:
  bolt/include/bolt/Core/BinaryBasicBlock.h
  bolt/include/bolt/Core/BinaryFunction.h
  bolt/include/bolt/Core/FunctionLayout.h
  bolt/lib/Core/BinaryContext.cpp
  bolt/lib/Core/BinaryEmitter.cpp
  bolt/lib/Core/BinaryFunction.cpp
  bolt/lib/Core/FunctionLayout.cpp
  bolt/lib/Passes/SplitFunctions.cpp
  bolt/lib/Rewrite/RewriteInstance.cpp

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