[PATCH] D118674: [nfc][mlgo][regalloc] Cache live interval feature components

[Mircea Trofin via Phabricator via llvm-commits]

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The features we cache are those that participate in weight computation,
just that we don't further aggregate them into a final number. To
maintain and invalidate the cache, we implement a VirtRegAuxInfo. The
features are lazily computed, and invalidated whenever
`calculateSpillWeightAndHint` is called (which is now virtual).

An effect of this is that VirtRegAuxInfo creation and ownership is on each advisor.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D118674

Files:
  llvm/include/llvm/CodeGen/CalcSpillWeights.h
  llvm/lib/CodeGen/MLRegallocEvictAdvisor.cpp
  llvm/lib/CodeGen/RegAllocEvictionAdvisor.cpp
  llvm/lib/CodeGen/RegAllocEvictionAdvisor.h
  llvm/lib/CodeGen/RegAllocGreedy.cpp
  llvm/lib/CodeGen/RegAllocGreedy.h

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