bcf9fb9802
~~NB: This PR depends on #78876. Ignore the first commit when reviewing, and don't merge it until #78876 is resolved. When/if #78876 lands, I'll clean this up.~~ This partially restores parity with the old, since removed debug build. We now can re-enable a bunch of the disabled tests. Some things of note: - `bounded_iter`'s converting constructor has never worked. It needs a friend declaration to access the other `bound_iter` instantiation's private fields. - The old debug iterators also checked that callers did not try to compare iterators from different objects. `bounded_iter` does not currently do this, so I've left those disabled. However, I think we probably should add those. See https://github.com/llvm/llvm-project/issues/78771#issuecomment-1902999181 - The `std::vector` iterators are bounded up to capacity, not size. This makes for a weaker safety check. This is because the STL promises not to invalidate iterators when appending up to the capacity. Since we cannot retroactively update all the iterators on `push_back()`, I've instead sized it to the capacity. This is not as good, but at least will stop the iterator from going off the end of the buffer. There was also no test for this, so I've added one in the `std` directory. - `std::string` has two ambiguities to deal with. First, I opted not to size it against the capacity. https://eel.is/c++draft/string.require#4 says iterators are invalidated on an non-const operation. Second, whether the iterator can reach the NUL terminator. The previous debug tests and the special-case in https://eel.is/c++draft/string.access#2 suggest no. If either of these causes widespread problems, I figure we can revisit. - `resize_and_overwrite.pass.cpp` assumed `std::string`'s iterator supported `s.begin().base()`, but I see no promise of this in the standard. GCC also doesn't support this. I fixed the test to use `std::to_address`. - `alignof.compile.pass.cpp`'s pointer isn't enough of a real pointer. (It needs to satisfy `NullablePointer`, `LegacyRandomAccessIterator`, and `LegacyContiguousIterator`.) `__bounded_iter` seems to instantiate enough to notice. I've added a few more bits to satisfy it. Fixes #78805
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