Added more functionality to dex file tracking.

Added functions that poison parts of String Data Items of Dex Files.
Also added a function that poisons less parts of a Code Item
, which reduces possibly unnecessary information.

Bug: 37754950
Test: export ART_DEX_FILE_ACCESS_TRACKING=true && m -j && m -j
SANITIZE_TARGET=address SANITIZE_LITE=true test-art-host

Change-Id: Icfd3db36e52beef4631f3ffd221d0a019cdd5308