comment out poor behaviour. inverse op of inverted preconditioner is unnecessary

Author: vpuri3

src/preconditioners.jl

@@ -26,6 +26,6 @@ struct InvPreconditioner{T}
 end
 
 Base.eltype(A::InvPreconditioner) = Base.eltype(A.P)
-LinearAlgebra.ldiv!(A::InvPreconditioner, x) = mul!(x, A.P, x)
+#LinearAlgebra.ldiv!(A::InvPreconditioner, x) = mul!(x, A.P, x)
 LinearAlgebra.ldiv!(y, A::InvPreconditioner, x) = mul!(y, A.P, x)
 LinearAlgebra.mul!(y, A::InvPreconditioner, x) = ldiv!(y, A.P, x)