x86_64: Implement VarHandle.set() for static and instance fields.
Benchmarks improvements (using benchmarks provided by
https://android-review.googlesource.com/1420959):
benchmark before after
--------------------------------------------
SetStaticFieldInt 2.421 0.00176
SetStaticFieldString 2.628 0.00230
SetFieldInt 2.665 0.00175
SetFieldString 2.914 0.00225
Bug: 65872996
Test: lunch aosp_cf_x86_64_phone-userdebug \
&& art/test.py --host -r -t 712-varhandle-invocations --64
Test: Repeat with ART_USE_READ_BARRIER=false.
Test: Repeat with ART_HEAP_POISONING=true.
Change-Id: I13acda88ab881c1274fcd8e154de61150409d974
3 files changed
