Differential D78369 Diff 265778 llvm/lib/Transforms/InstCombine/InstCombineInternal.h

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	/// Combiner aware instruction erasure.			/// Combiner aware instruction erasure.
	///			///
	/// When dealing with an instruction that has side effects or produces a void			/// When dealing with an instruction that has side effects or produces a void
	/// value, we can't rely on DCE to delete the instruction. Instead, visit			/// value, we can't rely on DCE to delete the instruction. Instead, visit
	/// methods should return the value returned by this function.			/// methods should return the value returned by this function.
	Instruction *eraseInstFromFunction(Instruction &I) {			Instruction *eraseInstFromFunction(Instruction &I) {
	LLVM_DEBUG(dbgs() << "IC: ERASE " << I << '\n');			LLVM_DEBUG(dbgs() << "IC: ERASE " << I << '\n');
	assert(I.use_empty() && "Cannot erase instruction that is used!");			assert(I.use_empty() && "Cannot erase instruction that is used!");
	salvageDebugInfoOrMarkUndef(I);			salvageDebugInfo(I);

	// Make sure that we reprocess all operands now that we reduced their			// Make sure that we reprocess all operands now that we reduced their
	// use counts.			// use counts.
	for (Use &Operand : I.operands())			for (Use &Operand : I.operands())
	if (auto *Inst = dyn_cast<Instruction>(Operand))			if (auto *Inst = dyn_cast<Instruction>(Operand))
	Worklist.add(Inst);			Worklist.add(Inst);

	Worklist.remove(&I);			Worklist.remove(&I);
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