David Green 21a97a2ac1 [AArch64] TBL uses zero for out of range elements. ...

A TBL instruction will use zero for any out of range values. We can use
this in GenerateTBL to help turn a TBL2 into a TBL1, avoiding the need
to materialise the zero.

Differential Revision: https://reviews.llvm.org/D121139

2022-03-10 14:45:13 +00:00

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