tests: add API_REGISTER_STATE_CHECK

tests: add API_REGISTER_STATE_CHECK

used to wrap API functions to ensure full environment consistency as
opposed to the renamed ASM_REGISTER_STATE_CHECK which is used with
assembly functions.
currently checks the FPU tag word in x86/x86_64 gcc builds to ensure
emms has been called.

Change-Id: Ie241772dbf903d33d516a1add4c8c6783f2e1490