[PATCH] Use a Factory Method for MachineFunctionInfo Creation

[Mehdi Amini]

Hi,

Attached is a patch that add a factory static method for MachineFunctionInfo Creation.

The context is that we want to have a pass which would be common to multiple backends. It uses a base MachineFunctionInfo class to communicate with a given backend. The backend specific passes needs to have specific fields in the MachineFunctionInfo class, and thus uses a subclass. The problem is that the “backend independent” pass only knows about the common MachineFunctionInfo subclass. Overriding the factory method allows to delegate the creation of the MachineFunctionInfo to a virtual method on the TargetMachine for instance.

— 
Mehdi

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