Update guarded devirtualization to handle struct returns

[AndyAyersMS]

Address this workaround:

runtime/src/coreclr/jit/indirectcalltransformer.cpp

Lines 526 to 543 in 81e867e

	// For now, bail on transforming calls that still appear
	// to return structs by value as there is deferred work
	// needed to fix up the return type.
	//
	// See for instance fgUpdateInlineReturnExpressionPlaceHolder.
	if (origCall->TypeGet() == TYP_STRUCT)
	{
	JITDUMP("*** %s Bailing on [%06u] -- can't handle by-value struct returns yet\n", Name(),
	compiler->dspTreeID(origCall));
	ClearFlag();
	// For stub calls restore the stub address
	if (origCall->IsVirtualStub())
	{
	origCall->gtStubCallStubAddr = origCall->gtInlineCandidateInfo->stubAddr;
	}
	return;
	}

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