Fix depwarning in tests that caused extreme slowdown (one(::CartesianIndex) -> oneunit(::CartesianIndex)

Author: chriselrod

test/gemm.jl

@@ -619,8 +619,8 @@
     Base.IndexStyle(::Type{<:SizedMatrix}) = Base.IndexLinear()
     Base.@propagate_inbounds Base.getindex(A::SizedMatrix, i::Int) = getindex(parent(A), i)
     Base.@propagate_inbounds Base.setindex!(A::SizedMatrix, v, i::Int) = setindex!(parent(A), v, i)
-    Base.@propagate_inbounds Base.getindex(A::SizedMatrix, i::CartesianIndex) = getindex(parent(A), i + one(i))
-    Base.@propagate_inbounds Base.setindex!(A::SizedMatrix, v, i::CartesianIndex) = setindex!(parent(A), v, i + one(i))
+    Base.@propagate_inbounds Base.getindex(A::SizedMatrix, i::CartesianIndex) = getindex(parent(A), i + oneunit(i))
+    Base.@propagate_inbounds Base.setindex!(A::SizedMatrix, v, i::CartesianIndex) = setindex!(parent(A), v, i + oneunit(i))
     Base.@propagate_inbounds Base.getindex(A::SizedMatrix, i::Int, j::Int) = getindex(parent(A), i+1, j+1)
     Base.@propagate_inbounds Base.setindex!(A::SizedMatrix, v, i::Int, j::Int) = setindex!(parent(A), v, i+1, j+1)
     Base.size(::SizedMatrix{M,N}) where {M,N} = (M,N)