Revert "[dsymutil] Gather function ranges during DIE selection." This reverts commit r231957. IntervalMap currently doesn't support keys more aligned than host pointers and I've been using it with uint64_t keys. This asserts on some 32bits systems. Revert while I work on an IntervalMap generalization. llvm-svn: 231967 GitOrigin-RevId: df41a3025005af41593fbd16a8f82b62fdea813c