Introduce `testrunner.py` configurations `art-gtest-asan{32,64}`.

These configurations (resp.) run only 32-bit (x86) tests or only
64-bit (x86-64) tests of `testrunner.py` configuration
`art-gtest-asan`.

The motivation behind these new test configurations is to shard the
original `art-gtest-asan` configuration, which is sometimes timing out
on ab/master-art-host build/test runs.

Test: DIST_DIR=/tmp/dist TARGET_PRODUCT=armv8 TARGET_BUILD_VARIANT=eng \
        ./art/test/testrunner/run_build_test_target.py -j80 \
        art-gtest-asan32
Test: DIST_DIR=/tmp/dist TARGET_PRODUCT=armv8 TARGET_BUILD_VARIANT=eng \
        ./art/test/testrunner/run_build_test_target.py -j80 \
        art-gtest-asan64
Bug: 249586057
Change-Id: Iaca58f135f06ed0f72748af17d75f9d7eb91c90c
1 file changed