[DFA-jump-threading] crash

[JonPsson1]

opt -mtriple=s390x-unknown-linux -mcpu=z16 -O3 -o /dev/null tc_crash56_aftercreduce.ll -two-entry-phi-node-folding-threshold=8 -sroa-skip-mem2reg -enable-dfa-jump-thread
tc_crash56.tar.gz

Assertion ... Instructions.h:2751: llvm::Value* llvm::PHINode::removeIncomingValue(const llvm::BasicBlock*, bool): Assertion `Idx >= 0
&& "Invalid basic block argument to remove!"' failed.

#11 0x0000000002b3324a llvm::DFAJumpThreadingPass::run

@UsmanNadeem @kazutakahirata @XChy