swift

cacfd3e3 - Rename llvm::support::endianness to llvm::endianness

Rename llvm::support::endianness to llvm::endianness LLVM is gearing up to move to `std::endianness` and as part of that has moved `llvm::support::endianness` to `llvm::endianness` (bbdbcd83e6702f314d147a680247058a899ba261). Rename our uses.