ADT: Use std::list in SparseBitVector, NFC
The only intrusive thing about SparseBitVector's usage of ilist<> was
that new was usually called externally. There were no custom traits.
It seems like the reason to switch to ilist in r41855 was to avoid
pointer invalidation, but std::list<> has that feature too. Maybe
std::list<>::emplace makes this a little more obvious than it was then.
Switch over to std::list<> and simplify the code.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@280573
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