Promote pointer to dex cache arrays on arm.

Do the use-count analysis on temps (ArtMethod* and the new
PC-relative temp) in Mir2Lir, rather than MIRGraph. MIRGraph
isn't really supposed to know how the ArtMethod* is used by
the backend.

Change-Id: Iaf56a46ae203eca86281b02b54f39a80fe5cc2dd
11 files changed