Another clarifying rename and a bit more automation.

Manually cherry-picked
Move InstrUtils in c++ files
Update some files to 4.3_r2.2
Use DexDebugInfo instead of DexFile
Use DexUtf instead of DexFile
Update dexopt to 4.3_r2.2
Update a lot of files to 4.3_r2.2
Update libdex/DexOpcodes.cpp to 4.3_r2.2