adjoint of new with fewer arguments than fields is broken

[acertain]

MRE:

using Zygote

struct MyStruct
    x::Float64
    y::Float64
    MyStruct(x) = new(x)
end

function create_and_use(x)
    s = MyStruct(x)
    return s.x * 2
end

println(create_and_use(1.0))

gradient(create_and_use, 2.0)

output:

2.0
ERROR: LoadError: ArgumentError: new: too few arguments (expected 2)
Stacktrace:
  [1] __new__
    @ ~/.julia/packages/Zygote/nsBv0/src/tools/builtins.jl:9 [inlined]
  [2] adjoint
    @ ~/.julia/packages/Zygote/nsBv0/src/lib/lib.jl:296 [inlined]
  [3] _pullback
    @ ~/.julia/packages/ZygoteRules/M4xmc/src/adjoint.jl:67 [inlined]
  [4] MyStruct
    @ /tmp/a.jl:6 [inlined]
  [5] create_and_use
    @ /tmp/a.jl:10 [inlined]
  [6] _pullback(ctx::Zygote.Context{false}, f::typeof(create_and_use), args::Float64)
    @ Zygote ~/.julia/packages/Zygote/nsBv0/src/compiler/interface2.jl:0
  [7] pullback(f::Function, cx::Zygote.Context{false}, args::Float64)
    @ Zygote ~/.julia/packages/Zygote/nsBv0/src/compiler/interface.jl:90
  [8] pullback
    @ ~/.julia/packages/Zygote/nsBv0/src/compiler/interface.jl:88 [inlined]
  [9] gradient(f::Function, args::Float64)
    @ Zygote ~/.julia/packages/Zygote/nsBv0/src/compiler/interface.jl:147
 [10] top-level scope
    @ /tmp/a.jl:16
in expression starting at /tmp/a.jl:16

Reverting #1220 fixes, also see JuliaLang/julia#47388

This is currently breaking SciMLSensitivity ZygoteAdjoint (not the only problem though).