[PATCH] D100387: Simplify BitVector code

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Instead of managing memory by hand, delegate it to std::vector. This makes the
code much simpler, easier to reason on and also avoids repeatedly computing the storage size.

      

According to valgrind --tool=callgrind, this also slightly decreases the
instruction count, but by a small margin.


https://reviews.llvm.org/D100387

Files:
  llvm/include/llvm/ADT/BitVector.h

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