nir: Add nir_imm_vec4_16
We already have nir_imm_float16 and nir_imm_vec4; let's add the ability to easily make immediate fp16 vectors as well, now that fp16 support is maturing in NIR/GLSL.
Signed-off-by: Alyssa Rosenzweig alyssa.rosenzweig@collabora.com
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See rt series for use.
Edited by Alyssa Rosenzweig