nir/split_vars: add some unit tests for casting

13 jobs for !873 with nir-split-vars-cast-tests in 10 minutes and 8 seconds (queued for 4 seconds)
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passed #499795
debian

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  Build+Test
passed #499804
meson-arm64

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passed #499803
meson-armhf

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passed #499797
meson-clang

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meson-clover

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passed #499805
meson-i386

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passed #499800
meson-main

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passed #499796
meson-swr-glvnd

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passed #499802
meson-vulkan

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passed #499807
scons-llvm

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passed #499806
scons-nollvm

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passed #499798
scons-swr

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scons-win64

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