[AArch64][SVE] Asm: Support for WHILE(LE|LO|LS|LT) instructions.
The WHILE instructions generate a predicate that is true while the
comparison of the first scalar operand (incremented for each predicate
element) with the second scalar operand is true and false thereafter.
WHILELE While incrementing signed scalar less than or equal to scalar
WHILELO While incrementing unsigned scalar lower than scalar
WHILELS While incrementing unsigned scalar lower than or same as scalar
WHILELT While incrementing signed scalar less than scalar
e.g.
whilele p0.s, x0, x1
generates predicate p0 (for 32bit elements) by incrementing
(signed) x0 and comparing that vector to splat(x1).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@338211
91177308-0d34-0410-b5e6-
96231b3b80d8
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