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ir3: prohibit folding of half->full conversion into mul.s24/u24

Danylo Piliaiev requested to merge Danil/mesa:ir3/fix/mul-24-prohibit-conversion-folding into main

mul.s24/u24 always return 32b result regardless of its sources size, hence we cannot guarantee the high 16b of dst being zero or sign extended.

Fixes cts tests on a650:

 dEQP-VK.spirv_assembly.type.scalar.i16.mul_test_high_part_zero_*
Edited by Danylo Piliaiev

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