AArch64: avoid splitting vector truncating stores.
We have code to split vector splats (of zero and non-zero) for performance
reasons, but it ignores the fact that a store might be truncating.
Actually, truncating stores are formed for vNi8 and vNi16 types. Since the
truncation is from a legal type, the size of the store is always <= 64-bits and
so they don't actually benefit from being split up anyway, so this patch just
disables that transformation.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@350620
91177308-0d34-0410-b5e6-
96231b3b80d8
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