[PATCH] D155006: [YAML][NFC] Use BumpPtrAllocator instead of unique_ptrs

[Amir Ayupov via Phabricator via llvm-commits]

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Use SpecificBumpPtrAllocators


Avoid both memory leaks and expensive dynamic allocations by using
BumpPtrAllocator for HNodes. It's expected they're not deallocated until the
`Input` class is destroyed, so deallocating all at once works well in this case.

Reduces YAML profile pre-processing time in BOLT from

>   11.2067 (  3.2%)   1.6487 (  7.3%)  12.8554 (  3.5%)  12.8635 (  5.6%)  pre-process profile data

to

>   10.6613 (  3.1%)   1.6489 (  6.7%)  12.3102 (  3.3%)  12.3134 (  5.3%)  pre-process profile data


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D155006

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

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