[llvm-commits] [Review request] Constant folding insertvalue instructions.

[Frits van Bommel]

Okay, so this is a bit embarrassing. I somehow completely missed
ConstantExpr::get{Insert,Extract}Value() methods. Instead of
reinventing the wheel, here's a much simpler patch that uses those
methods to add both insertvalue and extractvalue folding to
ConstantFoldInstruction().

Okay to commit?
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