Relax block ordering constraints (#1535)

* Relax block ordering constraints

Before `block.Next` had to follow `block.ListNext`, now it does not.
Instead `CodeGenerator` will now emit the necessary jump instructions
to ensure control flow.

This makes control flow and block order modifications easier. It also
eliminates some simple cases of redundant branches.

* Set PPTC version

ARMeilleure/CodeGen/RegisterAllocators/HybridAllocator.cs

@@ -427,18 +427,5 @@ namespace ARMeilleure.CodeGen.RegisterAllocators
         {
             return local.Assignments.Count + local.Uses.Count;
         }
-
-        private static IEnumerable<BasicBlock> Successors(BasicBlock block)
-        {
-            if (block.Next != null)
-            {
-                yield return block.Next;
-            }
-
-            if (block.Branch != null)
-            {
-                yield return block.Branch;
-            }
-        }
     }
 }