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This change fixes a bug in SelectionDAGBuilder::visitInsertValue and SelectionDAGBuilder::visitExtractValue where constant expressions (InsertValueConstantExpr and ExtractValueConstantExpr) would be treated as non-constant instructions (InsertValueInst and ExtractValueInst). This bug resulted in an incorrect memory access, which manifested as an assertion failure in SDValue::SDValue.
Fixes PR#33094.
Submitted on behalf of @Praetonus (Benoit Vey)
Differential Revision: https://reviews.llvm.org/D34538
llvm-svn: 307502
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