Subzero: Changes needed for LLVM 3.7 integration.

1. Change Makefile.standalone from 3.6 to 3.7.

2. Update to new load instruction .ll syntax.  This includes changing InstLoad::dump() to match.

BUG= none
R=jvoung@chromium.org

Review URL: https://codereview.chromium.org/1161543005
23 files changed