Since the tested functions are always forced inline in regular use,
ASM_REGISTER_STATE_CHECK doesn't make sense on this level (the test
should rather be applied to unit tests checking functions making use
of these inlined functions).  The test fails on Win64 because the
Win64 ABI requires xmm6 to xmm15 to be preserved across function
calls, but the ABI is only relevant for non-inlined functions.

BUG=aomedia:371

Change-Id: Icb795083f69465cf09ec8f6871899943efaeaab8