Florian Hahn 9b41a7320d Recommit "[DSE] Preserve basic block ordering using OrderedBasicBlock."
Updated to use DenseMap::insert instead of [] operator for insertion, to
avoid a crash caused by epoch checks.

This reverts commit 2b85de438326f9d27bc96dc934ec98b98abdb337.

llvm-svn: 357257
2019-03-29 14:10:24 +00:00
..
2019-03-12 07:08:19 +00:00
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