[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.

llvm-svn: 264320

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp b/llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
index e5c7ade8859..9a99968b0ad 100644
--- a/llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
@@ -356,7 +356,7 @@ void FunctionLoweringInfo::clear() {
   ByValArgFrameIndexMap.clear();
   RegFixups.clear();
   StatepointStackSlots.clear();
-  StatepointRelocatedValues.clear();
+  StatepointSpillMaps.clear();
   PreferredExtendType.clear();
 }