Added scripts to analyze sanitizer poisoning

Scripts are meant to be used in conjunction with DexFileTrackingRegistrar.
After poisoning certain sections of a dex file, the logcat will contain
traces in addition to information of dex files. This is used in order to
condense the large amount of information that is dumped into the logcat.

Bug: 37754950
Test: art/tools/runtime_memusage/sanitizer_logcat_analysis.sh
[LOGCAT_FILE]

Change-Id: Ied28e09899ec097f09332784bf80481f9c7dcb3f