[PATCH] D76465: [ADT] CoalescingBitVector: Avoid initial heap allocation, NFC

[Vedant Kumar via Phabricator via llvm-commits]

vsk created this revision.
vsk added reviewers: aprantl, jmorse, aemerson.
vsk added a project: debug-info.
Herald added subscribers: dexonsmith, hiraditya.
Herald added a reviewer: aartbik.

Avoid making a heap allocation when constructing a CoalescingBitVector.

This reduces time spent in LiveDebugValues when compiling sqlite3 by
700ms (0.5% of the total User Time).

rdar://60046261


https://reviews.llvm.org/D76465

Files:
  llvm/include/llvm/ADT/CoalescingBitVector.h
  llvm/lib/CodeGen/LiveDebugValues.cpp
  llvm/unittests/ADT/CoalescingBitVectorTest.cpp

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