Implement BitMemory{Reader,Writer}

Two simple classes which replace the need to pass
the (BitMemoryRegion, bit_offset) tuple everywhere.

The slightly simplifies the code and it also makes
it possible to optimize those classes in the future.

Test: test-art-host-gtest-stack_map_test
Test: test-art-host-gtest-bit_table_test
Change-Id: I4806c805149a07e1a11b76405ca27960a0012c69