Created by: egrimley
Add the program "api.reenc-a64", which decodes and then reencodes all 32-bit words in a given range, checking for consistency. On server hardware the full range (0-0xffffffff) is likely to take less than two hours divided by the number of available cores. This test can be run when modifying the encoder/decoder or when preparing a release.
Change-Id: I4941bc16b03b4a95834fabf70fea40cb465e0275