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EIGH pullback rules aren't GPU-friendly #229

@kshyatt

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@kshyatt

cf https://buildkite.com/julialang/matrixalgebrakit-dot-jl/builds/2714#019e2099-3d27-4688-9409-6ff615e2f5d6

Culprit for scalar indexing is https://github.com/QuantumKitHub/MatrixAlgebraKit.jl/blob/main/src/pullbacks/eigh.jl#L33

One simple solution for now would be to just compute maximum(abs, bc) while I add support for the norm(bc, Inf) in GPUArrays

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