[VPlan] Separate out logic to manage IR flags to VPIRFlags (NFC). (#140621) This patch moves the logic to manage IR flags to a separate VPIRFlags class. For now, VPRecipeWithIRFlags is the only class that inherits VPIRFlags. The new class allows for simpler passing of flags when constructing recipes, simplifying the constructors for various recipes (VPInstruction in particular, which now just has 2 constructors, one taking an extra VPIRFlags argument. This mirrors the approach taken for VPIRMetadata and makes it easier to extend in the future. The patch also adds a unified flagsValidForOpcode to check if the flags in a VPIRFlags match the provided opcode. PR: https://github.com/llvm/llvm-project/pull/140621
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