Process new system property for max JIT cache size

To allow low-memory devices to reduce (or eliminate entirely)
the RAM used by the JIT, dalvikvm has a new command-line
option to set the max size of the JIT's translation cache.
In this CL, we pass that new option based on a system property.

Change-Id: I2a01da4d19c1922b6ed52791ee513efef9caf3d4