ARM/ARM64: Use introspection marking for JITted code.

Impact on Golem benchmarks is within noise.

Test: m test-art-host-gtest
Test: Pixel 2 XL boots.
Test: testrunner.py --target --optimizing --jit
Bug: 36141117
Change-Id: Idf5177ee5cd34e2034d298a7907240b3e3e12d82
4 files changed