Clean up InductionVarAnalysis.

Move temporary members to local variables and allocations
from `ArenaAllocator` to `ScopedArenaAllocator`. While this
requires passing more parameters around, it also exposes
whether these parameters are constant or mutable.

Rewrite the strongly connected component (SCC) search to
avoid recursion. The recursion depth was dependent on the
input code, so essentially arbitrary, and therefore there
was a risk of stack overflow.

Clean up a few other minor things in `InductionVarAnalysis`
and `LoopOptimization`.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Bug: 216762268
Change-Id: Ifed50b8e62e47487edc683564352880df2158247

0 files changed, 0 insertions, 0 deletions