Add explicit compiler option to enable test-specific features.

We can no longer rely on checking the "core.art" image name,
since we plan to remove it and use the shipped boot image.

This option enables test-specific features, such as $noinline$.

Test: ./art/test.py -r --optimizing --64
Bug: 147817558
Change-Id: Iadac6e1b0f46e83efd0551fb8462a6b268ad33d8
9 files changed