nir: vec8/vec16 fixes
When vec8/vec16 support was added for CL, some places where missed. This MR adds several that were found during bring up of the not-yet-merged CLOn12 compiler.
/cc @karolherbst
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When vec8/vec16 support was added for CL, some places where missed. This MR adds several that were found during bring up of the not-yet-merged CLOn12 compiler.
/cc @karolherbst