tree d0ac4dca432e1bb26e21634f21ffc3e05db5020e
parent a8188191477b7b5b01a3c4426c51c48cd55f6678
author Aart Bik <ajcbik@google.com> 1477005256 -0700
committer Aart Bik <ajcbik@google.com> 1477338948 -0700

Improved induction variable analysis and loop optimizations.

Rationale:
Rather than half-baked reconstructing cycles during loop optimizations,
this CL passes the SCC computed during induction variable analysis
to the loop optimizer (trading some memory for more optimizations).
This further improves CaffeineLogic from 6000us down to 4200us (dx)
and 2200us to 1690us (jack). Note that this is on top of prior
improvements in previous CLs. Also, some narrowing type concerns
are taken care of during transfer operations.

Test: test-art-host
Change-Id: Ice2764811a70073c5014b3a05fb51f39fd2f4c3c