Rollup merge of #48840 - varkor:idxset-cleanup, r=pnkfelix
Remove some unnecessary IdxSet methods This replaces `IdxSet:: reset_to_empty` with `IdxSet:: clear`, and `IdxSet::elems`/`IdxSet::each_bit` with `IdxSet::iter`. Based on some [comments on #rustc](https://botbot.me/mozilla/rustc/2018-01-23/?msg=96063396). r? @pnkfelix
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