ARM64: Fix Liveness update for Division By Zero

ARM64: Fix Liveness update for Division By Zero

We've missed updating liveness when converting division by zero to a
throw. This fixes an assertion failure in `assert(!varDsc->lvIsRegCandidate());` in
codegenarm64.cpp/L1903.
genConsumeOperands() is factored out of genCodeForBinary(). The call sites
appropriately invoke genConsumeOperands() to update liveness.