Jan Svoboda 622354a522 [llvm][ADT] Implement BitVector::{pop_,}back ...

LLVM Programmer’s Manual strongly discourages the use of `std::vector<bool>` and suggests `llvm::BitVector` as a possible replacement.

Currently, some users of `std::vector<bool>` cannot switch to `llvm::BitVector` because it doesn't implement the `pop_back()` and `back()` functions.

To enable easy transition of `std::vector<bool>` users, this patch implements `llvm::BitVector::pop_back()` and `llvm::BitVector::back()`.

Reviewed By: dexonsmith

Differential Revision: https://reviews.llvm.org/D117115

2022-01-21 14:50:53 +01:00

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