[Mesa-dev] PowerPC: Add Altivec vector add/sub intrisics

[Adhemerval Zanella]

This patch add correct vector addition and subtraction intrisics when
using Altivec with PPC. Current code uses default path and LLVM backend
ends up issuing carry-out arithmetic instruction while it is expected
saturated ones.

It also includes a fix for PowerPC where char are unsigned by default,
resulting in bogus values for vector shifting.

The patch corrects the lp_test_blend testcase. Any tips, advices,
comments?


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