Enable support of VecLoad/VecStore in LSE

Changes:
- Enable VecLoad and VecStore support in LSE.
- This CL is based on Mingyao's CL: More general store elimination.
- The new gtest load_store_elimination_test is to test some corner cases
  where ArrayGet/ArraySet/VecLoad/VecStore are mixed and overlap.
- The new java 530-checker-lse-simd.

Test: test.py --host --optimizing --jit --gtest
Test: test.py --target --optimizing --jit
Test: run-gtests.sh
Test: load_store_elimination_test
Test: 530-checker-lse-simd
Test: ./art/test/run-test --optimizing --64 --gcstress 667-checker-simd-alignment
Test: m -j80 art-check-testing-apex-gen

Change-Id: I2d2024ec75a2aaef56b527db98abb40c5f16be79
8 files changed