Layout string data

Inspect dex code in class initializers and hot methods to find out
what const strings are likely to be resolved. Along with these,
look at static field accesses and group the field name and type with
other hot strings.

Group method shorties together.

Maps vdex PSS: 7478k -> 6900k
No change in odex PSS.

Changed dexlayout_test to use -v instead of comparing to a hex
output.

Bug: 36457259
Bug: 35800981

Test: test-art-host

(cherry picked from commit fa0aa095)

Change-Id: Iaa5de649c5b2b1d9f178525d2f42fe00e3fb879f