Clean up ART intrinsics. Change `intrinsics_list.h` to a normal include file instead of the weird include-use-and-undef pattern. Prefix macros defined in that file with `ART_`. And also remove blank lines at end of some files and address some comments on merged changes. Test: m test-art-host-gtest Test: testrunner.py --host --optimizing Bug: 283082089 Change-Id: I9c462f973c0c4bb53eff39fbe191014f6321d7c5