Add dexanalyze tool

Used to gather statistics about dex files.

Sample output:
Cumulative analysis for 240 DEX files
Num string ids: 9809636
Num method ids: 11334990
Num field ids: 8281881
Num type ids: 2291729
Num class defs: 1604550
Same class direct: 1577080
Other class direct: 5114002
Same class virtual: 2118445
Other class virtual: 15998142
Same class static: 693507
Other class static: 6496367
Num strings accessed from code: 5832974
Unique(per class) method ids accessed from code: 15169103
Unique(per class) string ids accessed from code: 4279695
Same class invoke: 4389032
Other class invoke: 27608511
Invokes from code: 31997543

Bug: 77709234
Bug: 77721545
Test: time dexanalyze -count-indices <APKS>
Test: mm test-art-host-gtest-dexanalyze_test -j64
Test: mm test-art-target-gtest-dexanalyze_test -j64

Change-Id: I3cd3fd10a9c540c7780942fc33f4eb4c7ff5d914