ART: Invoke Checker from run-test scripts

This patch moves Checker-based tests of the optimizing compiler into
the art/test directory and modifies the run-test scripts to dump
the CFG during compilation and to verify the graph using Checker as
part of the "running" stage. Outputs generated by running the test
and running Checker are concatenated and compared with expected.txt.

Checker is invoked only if the test's name name matches the format
"<number>-checker-*" and it's currently enabled only for optimizing +
host configs. The tests are still invoked on other configs but
without Checker.

Change-Id: Ib24da808cd4bca66f07e0dbeb913a418065f2859