[VPlan] Populate and use VPIRMetadata from VPInstructions (NFC) (#167253) Update VPlan to populate VPIRMetadata during VPInstruction construction and use it when creating widened recipes, instead of constructing VPIRMetadata from the underlying IR instruction each time. This centralizes VPIRMetadata in VPInstructions and ensures metadata is consistently available throughout VPlan transformations. PR: https://github.com/llvm/llvm-project/pull/167253
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