Switch InterpreterFrame to deterministic unwinding

[am11]

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[janvorli]

I don't think this is going to work. We need to know the callee saved registers value in the InterpExecMethod function. The ones we capture in the IntepreterFrame are not necessarily related. Both the ExecuteInterpretedMethod and InterpExecMethod can modify these registers.

[am11]

@janvorli, good point. The TransitionBlock values are from InterpreterStub and can be stale by the time we're in InterpExecMethod. I've reworked this to call ClrCaptureContext from within InterpExecMethod's try block instead, so we get the correct callee-saved register values and an IP that falls within the try range.