Use loops to build combinations of run-tests.

Add a JNI force copy test.
Split tracing from GC, relocation from prebuilding.
As the combinations of tests is sufficiently large to cause make serious work,
only build rules for tests that will be executed. Default to small number of
tests rather than full. Use ART_TEST_FULL=true to override.

Change-Id: Ic25431f29071b840d2e2295be6853511c0b52cfa