Sanjoy Das 2080172098 [Statepoints] Fix yet another issue around gc pointer uniqueing
Given that StatepointLowering now uniques derived pointers before
putting them in the per-statepoint spill map, we may end up with missing
entries for derived pointers when we visit a gc.relocate on a pointer
that was de-duplicated away.

Fix this by keeping two maps, one mapping gc pointers to their
de-duplicated values, and one mapping a de-duplicated value to the slot
it is spilled in.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264320 91177308-0d34-0410-b5e6-96231b3b80d8
2016-03-24 18:57:39 +00:00
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