ART: Fix up some multi-image cases

Change the auto-generated multi-image names to include the path
components from the first image, as well as prefix them with the
first image's name to disambiguate. This fixes vogar-style usage.

Fix an out-of-bounds issue in dex2oat when dex files are missing.

Forbid generating or patching multi-image parts when loading images.
Instead just fail loading them.

Remember ImageSpace instances that have been added while trying to
load a multi-image set. Remove all loaded instances when the overall
loading process fails.

Refactor the dex location adaptation into ImageSpace. Reuse the code
in the Runtime path for fallback, so that all dex files can be found
correctly.

Fix an out-of-bounds access in OatFileAssistant in fallback mode.

Partially reverts d895961d. Push an
actual image name, that is, something with an art extension, to
the vogar scripts.

Partially reverts c525604b. Test
119-noimage-patchoat works again.

Bug: 26317072
Bug: 26320300
Change-Id: I3f05fa77f22a2b9ca54c3105ffc53646c1928604