Builtin precision tests

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


Start testcase: precision.atanh.lowp_vertex.scalar
PASS precision.atanh.lowp_vertex.scalar: All 16404 inputs passed.

Start testcase: precision.atanh.lowp_vertex.vec2
PASS precision.atanh.lowp_vertex.vec2: All 16404 inputs passed.

Start testcase: precision.atanh.lowp_vertex.vec3
PASS precision.atanh.lowp_vertex.vec3: All 16404 inputs passed.

Start testcase: precision.atanh.lowp_vertex.vec4
PASS precision.atanh.lowp_vertex.vec4: All 16404 inputs passed.

Start testcase: precision.atanh.lowp_fragment.scalar
PASS precision.atanh.lowp_fragment.scalar: All 16404 inputs passed.