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nir/serialize: fix vec8 and vec16

Karol Herbst requested to merge karolherbst/mesa:nir_serialize_fixes into master

Nir serializes uses nir_ssa_alu_instr_src_components in a few places to determine how many components a src has, but that's not what this function returns. It simply returns how many channels are used, which is still fine for most of the code.

This was breaking code like this:

vec16 32 ssa_1 = intrinsic load_global
vec1  32 ssa_2 = fmax ssa_1.a, ssa_2.b
Edited by Karol Herbst

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