[PATCH] D152758: [NFC] Refact MBB hotness/coldness into MBFI.

[Han Shen via Phabricator via llvm-commits]

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[NFC] In D152399 <https://reviews.llvm.org/D152399>, we calculate BPI->BFI in MachineFunctionSplit pass just to use PSI->isFunctionHotInCallGraph, which is expensive.  Instead, we can implement this directly with MBFI.

Reviewer @wenlei mentioned in his commet, that machine_size_opts already has isFunctionColdInCallGraph, isFunctionHotInCallGraphNthPercentile, etc implemented. These can be refactored and reused across MFS and machine size opts.

This CL does this - it refactors out those internal static functions into MachineBlockFrequencyInfo as member functions, so they can be accessed easily.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D152758

Files:
  llvm/include/llvm/CodeGen/MachineBlockFrequencyInfo.h
  llvm/lib/CodeGen/MachineBlockFrequencyInfo.cpp
  llvm/lib/CodeGen/MachineSizeOpts.cpp

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