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, 1 deletions

diff --git a/compiler/optimizing/stack_map_stream.h b/compiler/optimizing/stack_map_stream.h
index de79f4921e..9d4598d3d9 100644
--- a/compiler/optimizing/stack_map_stream.h
+++ b/compiler/optimizing/stack_map_stream.h
@@ -34,7 +34,7 @@ namespace art {
  * Collects and builds stack maps for a method. All the stack maps
  * for a method are placed in a CodeInfo object.
  */
-class StackMapStream : public ValueObject {
+class StackMapStream : public DeletableArenaObject<kArenaAllocStackMapStream> {
  public:
   explicit StackMapStream(ScopedArenaAllocator* allocator, InstructionSet instruction_set)
       : instruction_set_(instruction_set),
@@ -53,6 +53,7 @@ class StackMapStream : public ValueObject {
         current_dex_registers_(allocator->Adapter(kArenaAllocStackMapStream)),
         previous_dex_registers_(allocator->Adapter(kArenaAllocStackMapStream)),
         dex_register_timestamp_(allocator->Adapter(kArenaAllocStackMapStream)),
+        expected_num_dex_registers_(0u),
         temp_dex_register_mask_(allocator, 32, true, kArenaAllocStackMapStream),
         temp_dex_register_map_(allocator->Adapter(kArenaAllocStackMapStream)) {
   }