Fangrui Song 6b8d04c23d [CodeLayout] Refactor std::vector uses, namespace, and EdgeCountT. NFC ...

* Place types and functions in the llvm::codelayout namespace
* Change EdgeCountT from pair<pair<uint64_t, uint64_t>, uint64_t> to a struct and utilize structured bindings.
  It is not conventional to use the "T" suffix for structure types.
* Remove a redundant copy in ChainT::merge.
* Change {ExtTSPImpl,CDSortImpl}::run to use return value instead of an output parameter
* Rename applyCDSLayout to computeCacheDirectedLayout: (a) avoid rare
  abbreviation "CDS" (cache-directed sort) (b) "compute" is more conventional
  for the specific use case
* Change the parameter types from std::vector to ArrayRef so that
  SmallVector arguments can be used.
* Similarly, rename applyExtTspLayout to computeExtTspLayout.

Reviewed By: Amir

Differential Revision: https://reviews.llvm.org/D159526

2023-09-21 13:13:03 -07:00

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