Vedant Kumar 4716ebb823 [ADT] CoalescingBitVector: Avoid initial heap allocation, NFC ...

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

Differential Revision: https://reviews.llvm.org/D76465

2020-03-20 12:18:25 -07:00

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