This is different from CanAlterRefCount since CanDecrementRefCount is
attempting to prove specifically whether or not an instruction can
decrement instead of the more general question of whether it can
decrement or increment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229936 91177308-0d34-0410-b5e6-96231b3b80d8
This is much better than the previous manner of just using
short-curcuiting booleans from:
1. A "naive" efficiency perspective: we do not have to rely on the
compiler to change the short circuiting boolean operations into a
switch.
2. An understanding perspective by making the implicit behavior of
negative predicates explicit.
3. A maintainability perspective through the covered switch flag making
it easy to know where to update code when adding new ARCInstKinds.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229906 91177308-0d34-0410-b5e6-96231b3b80d8
I also renamed ObjCARCUtil.cpp -> ARCInstKind.cpp. That file only contained
items related to ARCInstKind anyways.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229905 91177308-0d34-0410-b5e6-96231b3b80d8
