freedreno/ir3: Enable core NIR's 16-bit ALU optimizations.
In addition to hopefully generating shorter code, this optimizes out a
comparison of a mediump-cast value in
dEQP-GLES2.functional.shaders.algorithm.rgb_to_hsl_fragment passed
through ANGLE, and allows the test to pass. We believe it to be a
test bug, but emitting better code like apparently everyone else does
is also a fine result.
No change on GLES gfxbench shaders.
Fixes: #6585
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17546>
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