Fix portable interpreter build.
Fix portable interpreter build.

The #define should check if __arm__ or __mips__ is defined. This was
causing the host build to be compiled incorrectly and loop forever
in dexopt.

Change-Id: I6d7a435f0a420a31f2a40d57456762c7fb1d3b4f

treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst,treadstoneproject/artinst