[PATCH] D152781: [NFC][BlockFrequency] Move operator definitions into header

[Dhruv Chawla via Phabricator via llvm-commits]

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While BlockFrequency::operator+= is a very simple operation, it's
definition is present in another TU which means that it doesn't get
inlined in non-LTO builds. This means that there is some performance
left on the table in those builds, as this operator is called many
times.

This patch moves that operator (and a few others) into the
BlockFrequency.h header which gives a small speedup (~0.1%):
https://llvm-compile-time-tracker.com/compare.php?from=6ee594be53e7efaa12086ad20f0d0268092a4c73&to=6ac6cd99e211fae5ae5de41ad608604aa22f1882&stat=instructions%3Au


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D152781

Files:
  llvm/include/llvm/Support/BlockFrequency.h
  llvm/lib/Support/BlockFrequency.cpp

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