[ADT] Overhaul the DenseMapIterator creation logic (NFC) (#156221)
Without this patch, it's overly complicated to create iterators in
DenseMap.
- We must specify whether to advance a newly created iterator, which
is needed in begin().
- We call shouldReverseIterate outside and inside DenseMapIterator.
This patch cleans up all this by creating factory methods:
- DenseMapIterator::makeBegin
- DenseMapIterator::makeEnd
- DenseMapIterator::makeIterator
With these:
- makeBegin knows that we need to advance the iterator to the first
valid bucket.
- Callers outside DenseMapIterator do not reference
shouldReverseIterate at all.
Now, it's a lot simpler to call helper functions
DenseMapBase::{makeIterator,makeConstIterator}. We just have to pass
the Bucket pointer:
makeIterator(Bucket);
and they take care of the rest, including passing *this as Epoch.
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