[Test-suite] Halide bitcode tests for AArch64.

[asbirlea]

Summary

Adding to test-suite some unit tests for AArch64 in bitcode format.
Source: Halide's simd_ops application.
Note this is a rather large patch due to the number of bitcode tests.

[rengolin]

Bitcode/simd_ops/simd_ops.cpp

11

You don't seem to be using this... at least not in this patch.

[asbirlea]

Bitcode/simd_ops/simd_ops.cpp

11

Agreed, I'll remove it until the next patch with the arm tests.

[asbirlea]

Remove ARM option.

[MatzeB]

LGTM