Fix running out of temps when storing invoke-interface result.

On ARM, after emitting invoke-interface we didn't have any
free temps to use for storing the result, so we would crash
if the result was an unpromoted dalvik register with stack
location too far from SP.

Bug: 18769895
Change-Id: Ie6c131d68f1853a8317b305a22eab22faea80e90