Merge the single-image test to TestExtension.

This avoids a potential failure where the required address
range could be allocated by gtest harness between tests.

This also reduces the number of "head" compilations by one,
reducing the time taken by ~6s on host; device not measured.

Test: m test-art-host-gtest-dex2oat_image_test
Bug: 146108614
Change-Id: I54774a877314964d4281412092d46d48e8da236b
1 file changed