Initial ART fuzzer for DEX verification

It fuzzes the verifier by generating DEX files,
trying to open them, and verify them.

Add a small corpus to start with:
 * Empty: Totally empty file (invalid DEX)
 * Main: Empty main (valid DEX)
 * Hello-world: Main that prints "Hello, world!"

Add a small dictionary with valid DEX headers.

Bug: 249085422
Change-Id: I9a6a555ea2462e7156669e1728815f8dcaacb23a
6 files changed