Craig Topper ac8c720d48 [IR] Allow constant folding (insertelement <vscale x 2 x i32> zeroinitializer, i32 0, i32 i32 0. ...

Most of insertelement constant folding is blocked if the vector type
is scalable. I believe we can make an exception for inserting null
into an all zeros vector.

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D123413

2022-04-15 17:44:32 -07:00

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