Revert "Support VecLoad and VecStore in LSE."

Somehow, this breaks:
./art/test/run-test --optimizing --64 --gcstress 667-checker-simd-alignment

This reverts commit 27dae5f3ce2d00b84eabf4cc4b7b2144af37a43a.

Change-Id: If552ebd8c14535c2eafbdc2ed0ff1f76ad29da35
3 files changed