Since new select/phi instructions may construct loops, the expression tree to be simplified may still be incomplete (i.e., it may contain select with dummy values or phi without incoming values). This patch removes the call to simplifyInstruction for now, as it doesn't break existing tests. Original PR: https://reviews.llvm.org/D36073 Fix the crash reported in https://github.com/llvm/llvm-project/pull/163453#issuecomment-3429922732.