[PATCH] D158442: [Propeller] Introduce the path cloning profile format to BasicBlockSectionsProfileReader.

[Rahman Lavaee via Phabricator via llvm-commits]

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The basic block cloning profile format changes the propeller profile in two ways.

1. Specifies the cloning paths with a "!!!" prefix. For example, !!!1 4 5 specifies that blocks with BB ids 4 and 5 must be cloned along the edge 1->4.
2. For each cloned block, it will appear in the cluster info as <bb_id>.<clone_id> where clone_id is the path id associated with this clone.

For example, the following profile specifies one cloned block (2) and determines its cluster position as well.

!foo
!!!1 2
!!0 1 2.1 3 2 5


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D158442

Files:
  llvm/include/llvm/CodeGen/BasicBlockSectionsProfileReader.h
  llvm/lib/CodeGen/BasicBlockSectionsProfileReader.cpp
  llvm/test/CodeGen/X86/basic-block-sections-clusters-error.ll

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