[llvm] [VPlan] Handle some VPInstructions in may{Read,Write}FromMemory (PR #120058)

[Mel Chen via llvm-commits]

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@@ -1351,6 +1351,28 @@ class VPInstruction : public VPRecipeWithIRFlags,
     }
   }
 
+  /// Returns true if the underlying opcode may read from or write to memory.
+  bool opcodeMayReadOrWriteFromMemory() const {
+    if (Instruction::isBinaryOp(getOpcode()))
+      return false;
+    switch (getOpcode()) {
+    case Instruction::Or:
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Mel-Chen wrote:

We don't need to check Instruction::Or since it is binary op.

https://github.com/llvm/llvm-project/pull/120058