Test from Halide suite checking simd operations.
Summary: This is an initial patch for feedback request on: 1. Location
of bitcode files 2. Building to assembly (separate discussion for using
llc with metadata from bitcode files) 3. Creating a single test vs a test for each simd operation
Subscribers: tberghammer, danalbert, srhines
Differential Revision: http://reviews.llvm.org/D17726