Duncan P. N. Exon Smith 7116af637c Reapply r215966, r215965, r215964, r215963, r215960, r215959, r215958, and r215957
This reverts commit r215981, which reverted the above commits because
MSVC std::equal asserts on nullptr iterators, and thes commits
introduced an `ArrayRef::equals()` on empty ArrayRefs.

ArrayRef was changed not to use std::equal in r215986.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215987 91177308-0d34-0410-b5e6-96231b3b80d8
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