[PATCH] D11342: Minor fixes for SparseBitVector

[Lenar Safin]

sl created this revision.
sl added a reviewer: dberlin.
sl added a subscriber: llvm-commits.
sl set the repository for this revision to rL LLVM.

1. Fix return value in `SparseBitVector::operator&=`.
2. Add checks if SBV is being assigned is invoking SBV.

Repository:
  rL LLVM

http://reviews.llvm.org/D11342

Files:
  ../include/llvm/ADT/SparseBitVector.h
  ../unittests/ADT/SparseBitVectorTest.cpp

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