Add support for running specific tests to run-gtests.sh.

Test: art/tools/run-gtests.sh
Test: art/tools/run-gtests.sh -h
Test: art/tools/run-gtests.sh -j4
Test: art/tools/run-gtests.sh /apex/com.android.art/bin/art/arm/instruction_set_features_test
Test: art/tools/run-gtests.sh -j4 /apex/com.android.art/bin/art/arm/instruction_set_features_test
Change-Id: Ie29819d27e2657e7c32c2b1f9ce830cbc136f2ed
2 files changed