This will help targets to define flags for virtual registers involved in special operations and can use them inside a target hook or somewhere at a later point to customize the codegen decisions.

This will help targets to customize certain codegen decisions based on the virtual registers involved in special operations. This patch also extends the existing delegate in MRI to start supporting multicast.

This will help targets to define flags for virtualcustomize certain codegen decisions based on the virtual registers involved in special operations and can use. This patch also them inside a target hook or somewhere at a later pointextends the existing delegate in MRI to customize the codegen decisionsstart supporting multicast.