Reuse arena memory for each block in scheduler.

This reduces the peak memory used for large methods with
multiple blocks to schedule.

Compiling the aosp_taimen-userdebug boot image, the most
memory hungry method BatteryStats.dumpLocked has the
Scheduler memory allocations in ArenaStack hidden by the
register allocator:
  - before:
    MEM: used: 8300224, allocated: 9175040, lost: 197360
    Scheduler       8300224
  - after:
    MEM: used: 5914296, allocated: 7864320, lost: 78200
    SsaLiveness     5532840
    RegAllocator     144968
    RegAllocVldt     236488
The total arena memory used, including the ArenaAllocator
not listed above, goes from 44333648 to 41950324 (-5.4%).
(Measured with kArenaAllocatorCountAllocations=true,
kArenaAllocatorPreciseTracking=false.)

Also remove one unnecessary -Wframe-larger-than= workaround
and add one workaround for large frame with the above arena
alloc tracking flags.

Test: m test-art-host-gtest
Test: testrunner.py --host
Bug: 34053922
Change-Id: I7fd8d90dcc13b184b1e5bd0bcac072388710a129

1 files changed, 2 insertions, 2 deletions

diff --git a/compiler/optimizing/scheduler_arm64.h b/compiler/optimizing/scheduler_arm64.h
index 4f394d5e16..0d2f8d9fa0 100644
--- a/compiler/optimizing/scheduler_arm64.h
+++ b/compiler/optimizing/scheduler_arm64.h
@@ -134,8 +134,8 @@ class SchedulingLatencyVisitorARM64 : public SchedulingLatencyVisitor {
 
 class HSchedulerARM64 : public HScheduler {
  public:
-  HSchedulerARM64(ScopedArenaAllocator* allocator, SchedulingNodeSelector* selector)
-      : HScheduler(allocator, &arm64_latency_visitor_, selector) {}
+  explicit HSchedulerARM64(SchedulingNodeSelector* selector)
+      : HScheduler(&arm64_latency_visitor_, selector) {}
   ~HSchedulerARM64() OVERRIDE {}
 
   bool IsSchedulable(const HInstruction* instruction) const OVERRIDE {