Add code item accessor helper classes

Add classes to abstract accesses to code item data. These classes
handle both standard dex and compact dex.

Added:
- CodeItemInstructionsAccessor to handle code item instructions.
- CodeItemDataAccessor to handle code item data excluding debug info.

Moved inline_method_analyzer to use the new classes to test the new
APIs.

Bug: 63756964
Test: test-art-host
Change-Id: I9926acb77b81fa64ed4a3b49b7bed1aab30a0f33