aco: improve sub-dword emit_split_vector() with sgprs

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <mesa/mesa!4639>
24 jobs for !4639 with aco_misc_8bit_16bit_mem_ops in 8 minutes and 3 seconds (queued for 2 seconds)
detached
Status Job ID Name Coverage
  Container
passed arm_build #2434735
aarch64

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passed arm_test #2434736
aarch64

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passed windows_build_vs2019 #2434737
windows shell 1809 mesa

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passed x86_build #2434731

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passed x86_build_old #2434734

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passed x86_test-gl #2434732

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passed x86_test-vk #2434733

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  Meson X86 64
passed meson-clang #2434741

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passed meson-classic #2434740

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passed meson-clover #2434742

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passed meson-clover-old-llvm #2434743

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passed meson-gallium #2434739

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passed meson-testing #2434738

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passed meson-vulkan #2434744

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  Scons
passed scons-win64 #2434745

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  Meson Misc
passed meson-arm64 #2434747
aarch64

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passed meson-arm64-build-test #2434748
aarch64

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passed meson-armhf #2434746
aarch64

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passed meson-i386 #2434750

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passed meson-mingw32-x86_64 #2434753

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passed meson-ppc64el #2434752
kvm

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passed meson-s390x #2434751
kvm

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passed meson-windows-vs2019 #2434749
windows docker 1809 mesa

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  Radv
passed radv-fossils #2434754

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