[Mesa-dev] RFC: PowerPC: Add Altivec pack/unpack intrisics

[Adhemerval Zanella]

Hi all,

This patch adds PPC Altivec support for pack/unpack operations using Altivec
supported vector type (8xi8, 16xi16, 4xi32, 4xf32). I focused my work on the
lp_test_conv testcase for llvmpipe and this patch corrects all the failing
issues for conversion using the aforementioned vector types.

I wasn't sure which code styling to use, so I tried to guess based on the
current style of the file. Any advices, tips, suggestions?

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