On Julia 1.5 importing produces warnings about fatally broken incremental compilation

[ssikdar1]

On using a relatively recent build of julia from master, adding DifferentialEquations via pkg and then calling using DifferentialEquations produces the following warning:

WARNING: Method definition combine_axes(Any, Any) in module Broadcast at broadcast.jl:474 overwritten in module DiffEqBase at /Users/ssikdar1/.julia/packages/DiffEqBase/H1xRL/src/diffeqfastbc.jl:18.
  ** incremental compilation may be fatally broken for this module **

While it's only a warning these warnings don't appear in julia 1.4.

1$ ./julia 
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.5.0-DEV.634 (2020-04-15)
 _/ |\__'_|_|_|\__'_|  |  Commit 4acd512579* (0 days old master)
|__/                   |

julia> using DifferentialEquations
[ Info: Precompiling DifferentialEquations [0c46a032-eb83-5123-abaf-570d42b7fbaa]
WARNING: Method definition combine_axes(Any, Any) in module Broadcast at broadcast.jl:474 overwritten in module DiffEqBase at /Users/ssikdar1/.julia/packages/DiffEqBase/H1xRL/src/diffeqfastbc.jl:18.
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition combine_axes(Any, Any) in module Broadcast at broadcast.jl:474 overwritten in module DiffEqBase at /Users/ssikdar1/.julia/packages/DiffEqBase/H1xRL/src/diffeqfastbc.jl:18.
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition combine_axes(Any, Any) in module Broadcast at broadcast.jl:474 overwritten in module DiffEqBase at /Users/ssikdar1/.julia/packages/DiffEqBase/H1xRL/src/diffeqfastbc.jl:18.
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition combine_axes(Any, Any) in module Broadcast at broadcast.jl:474 overwritten in module DiffEqBase at /Users/ssikdar1/.julia/packages/DiffEqBase/H1xRL/src/diffeqfastbc.jl:18.
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition combine_axes(Any, Any) in module Broadcast at broadcast.jl:474 overwritten in module DiffEqBase at /Users/ssikdar1/.julia/packages/DiffEqBase/H1xRL/src/diffeqfastbc.jl:18.
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition combine_axes(Any, Any) in module Broadcast at broadcast.jl:474 overwritten in module DiffEqBase at /Users/ssikdar1/.julia/packages/DiffEqBase/H1xRL/src/diffeqfastbc.jl:18.
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition combine_axes(Any, Any) in module Broadcast at broadcast.jl:474 overwritten in module DiffEqBase at /Users/ssikdar1/.julia/packages/DiffEqBase/H1xRL/src/diffeqfastbc.jl:18.
  ** incremental compilation may be fatally broken for this module **

WARNING: Method definition combine_axes(Any, Any) in module Broadcast at broadcast.jl:474 overwritten in module DiffEqBase at /Users/ssikdar1/.julia/packages/DiffEqBase/H1xRL/src/diffeqfastbc.jl:18.
  ** incremental compilation may be fatally broken for this module **

julia> VERSION
v"1.5.0-DEV.634"

[ChrisRackauckas]

Xref: JuliaLang/julia#35260 . We need to put an if statement over that now. Does it need to be a static if?