Juneyoung Lee 3a60a1f165 [InstSimplify] Fold insertelement vec, poison, idx into vec ...

This is a simple patch that adds folding from `insertelement vec, poison, idx` into `vec`.

Alive2 proof: https://alive2.llvm.org/ce/z/2y2vbC

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D93994

2021-01-07 10:10:14 +09:00

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