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cd73eace2f
Add an assertion to the MachineInstrBundleIterator from instr_iterator that the underlying iterator is valid. This is possible know that we can check ilist_node::isSentinel (since r281168), and is consistent with the constructors from MachineInstr* and MachineInstr&. Avoiding the new assertion in operator== and operator!= requires four (!!!!) new overloads each. (As an aside, I'm strongly in favour of: - making the conversion from instr_iterator explicit; - making the conversion from pointer explicit; - making the conversion from reference explicit; and - removing all the extra overloads of operator== and operator!= except const_instr_iterator. I'm not signing up for that at this point, but being clear about when something is an MachineInstr-iterator (possibly instr_end()) vs MachineInstr-bundle-iterator (possibly end()) vs MachineInstr* (possibly nullptr) vs MachineInstr& (known valid) would surely make code cleaner... and it would remove a ton of boilerplate from MachineInstrBundleIterator operators.) llvm-svn: 281170
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