Allow box_this pattern on composite r2r

[BrzVlad]

For the following code:

struct MyStruct
{
   public int Value;
}

static string CallToString<T>(ref T val) where T : struct
{
   // constrained. T callvirt ToString()
   return val.ToString();
}

var s = new MyStruct { Value = 42 };
Console.WriteLine(CallToString(ref s));

The CallToString method would be skipped by r2r because, in this state, if user would change MyStruct to contain an override for ToString then the generated code for CallToString would be incorrect since it should no longer do any boxing. For composite r2r however, this is not a problem if the valuetype (MyStruct) and the compiled method (CallToString) are in the same version bubble. The fix adds a check that these are in the same version bubble.

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