Problem: Some tests assume that all local work-items can be used in a
single dimension of an NDRange.
Spec References: OpenCL C 2.0 r19, table 4.3,
CL_DEVICE_MAX_WORK_ITEM_SIZES.
Solution: The overall maximum local work size is trimmed to that of an
NDRange's first dimension or all dimensions, as appropriate.
Test Suite Affected: atomics, non_uniform_work_group, and workgroups.
Side Effects: None
Change-Id: I2e8179ca15c2c090f47ea84d1d3c109dd69ec185
