Intermittent inference test failure

[Keno]

Error in testset Compiler/inference:
--
  | Test Failed at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-grannysmith-C07ZQ07FJYVY.0/build/default-grannysmith-C07ZQ07FJYVY-0/julialang/julia-master/julia-76319085f6/share/julia/Compiler/test/inference.jl:3553
  | Expression: Base.return_types(f_overly_abstract_complex, Tuple{}) == [Complex]
  | Evaluated: Any[Any] == UnionAll[Complex]

E.g. https://buildkite.com/julialang/julia-master/builds/49331/steps/canvas?jid=0198336b-61ad-4008-8f44-ff9ba7c95cd3.

Probably an ordering issue.

[Keno]

Fails consistently with JULIA_CPU_THREADS=1 ./julia test/runtests.jl LinearAlgebra/unitful LinearAlgebra/special LinearAlgebra/symmetric LinearAlgebra/cholesky LinearAlgebra/qr LinearAlgebra/generic LinearAlgebra/eigen LinearAlgebra/factorization LinearAlgebra/ldlt LinearAlgebra/bitarray ambiguous subarray intfuncs functional iterators spawn backtrace exceptions read version namedtuple mpfr broadcast ranges goto llvmcall llvmcall2 ryu some meta stacktraces misc Compiler/inference Will try to cut down some more

[maleadt]

Reduced: JULIA_CPU_THREADS=1 ./build/dev/julia test/runtests.jl LinearAlgebra/cholesky ranges Compiler/inference

[Keno]

These tests both add the following methods:

 [5] (::Type{T})(x::Furlong{0}) where T<:Number
     @ ~/julia/test/testhelpers/Furlongs.jl:17
 [6] (::Type{T})(x::Main.LinearAlgebraTestHelpers.Furlongs.Furlong{0}) where T<:Number
     @ ~/julia/usr/share/julia/stdlib/v1.13/LinearAlgebra/test/testhelpers/Furlongs.jl:17

Since Complex <: Number, this cause too many methods to match there and this test to fail.