Commits on Mar 2, 2017

1. Jit interface support for devirtualization …

   Add new method to jit interface so the jit can determine what derived
   method might be called for a given base method, derived class pair.
   
   Implement support in the VM and in other places (zap, spmi).

   

   AndyAyersMS committed Mar 2, 2017
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2. Devirtualize calls in some simple cases …

   Devirtualize calls where the this object type at a call site
   is a subtype of the type described at the call site. Currently learns
   types from local and arg references and a subset of other operators.
   
   Will devirtualize if either the class or method is final (sealed in C#),
   or if the type is known exactly (eg from a newobj).
   
   Devirtualization is run twice, once during importation, and again in a
   limited way after inlinining. Calls devirtualized during importation are
   are subsequently eligible for inlining. Calls devirtualized during inlining
   currently cannot be inlined.

   

   AndyAyersMS committed Mar 2, 2017
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