John Brawn 1b53749575
[LICM] Adjust how moving the re-hoist point works ...
In some cases the order that we hoist instructions in means that when rehoisting
(which uses the same order as hoisting) we can rehoist to a block A, then a
block B, then block A again. This currently causes an assertion failure as it
expects that when changing the hoist point it only ever moves to a block that
dominates the hoist point being moved from.
Fix this by moving the re-hoist point when it doesn't dominate the dominator of
hoisted instruction, or in other words when it wouldn't dominate the uses of
the instruction being rehoisted.
Differential Revision: https://reviews.llvm.org/D55266
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@350408 91177308-0d34-0410-b5e6-96231b3b80d8
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John Brawn
1b53749575