Clean up after MIPS got read barriers support

This enables checker tests, as well as compiler_driver_test and
reflection_test for MIPS32 and MIPS64.

Test: mma test-art-host-gtest
Test: mma test-art-target-gtest in QEMU (MIPS64)
Test: ./testrunner.py --optimizing --target in QEMU (MIPS64)

Change-Id: Ic6fe5b17f7f2cd7e38e12fef25afccf9358b80e0
5 files changed