arm, arm64: Unpoison byte array view class reference before comparison.

Varhandle class reference needs to be unpoisoned before it gets compared
to the byte array view class reference from the boot image returned by
`LoadClassRootForIntrinsic`. This was missing in the CLs that added
varhandle intrinsics for byte array views and resulted in byte array
views handled by the slow path if poisoning is enabled:
  - https://r.android.com/1535201 (arm64)
  - https://r.android.com/1555075 (arm)

Bug: 71781600

Test: Ran benchmarks provided by https://r.android.com/1420959 with
  ART_HEAP_POISONING=true before and after the change, observed improved
  run time for byte array views (on sargo, arm64):

                                before  after
  -------------------------------------------
  GetByteArrayViewInt             9.86  0.074
  SetByteArrayViewInt            10.07  0.074
  GetByteArrayViewBigEndianInt   10.40  0.077
  SetByteArrayViewBigEndianInt   10.07  0.077

Test: art/test.py --target -r -t 712-varhandle-invocations
Test: same with ART_HEAP_POISONING=true
Change-Id: Ie776b44759df642d3227a64b824caa0b21ffd5e6
2 files changed