lima/ppir: support nir_op_ftrunc

Support nir_op_ftrunc by turning it into a mov with a round to integer
output modifier.

Signed-off-by: Erico Nunes <nunes.erico@gmail.com>
Reviewed-by: Qiang Yu <yuq825@gmail.com>
11 jobs for !757 with lima-ppir-ftrunc in 9 minutes and 44 seconds (queued for 1 second)
latest detached
Status Name Job ID Coverage
  Containers Build
passed debian #278394

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  Build+Test
passed meson-clang #278396

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passed meson-clover-llvm #278399

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passed meson-clover-llvm39 #278400

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passed meson-main #278398

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passed meson-swr-glvnd #278395

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passed meson-vulkan #278397

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passed scons-llvm #278402

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passed scons-nollvm #278401

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passed scons-swr #278403

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passed scons-win64 #278404

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