handle GlobalRef in getfield elim pass

[JeffBezanson]

This fixes this odd failure in ODE.jl:

ERROR: LoadError: MethodError: no method matching size(::Symbol, ::Int64)
Closest candidates are:
  size(!Matched::BitArray{1}, ::Integer) at bitarray.jl:81
  size(!Matched::Tuple, ::Integer) at tuple.jl:22
  size(!Matched::Number, ::Integer) at number.jl:63
  ...
Stacktrace:
 [1] oderosenbrock(::var"#3#4", ::Float64, ::Array{Float64,1}, ::Float64, ::Symbol, ::Array{Float64,2}, ::Array{Float64,2}; jacobian::Nothing, kwargs::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at /home/jeff/.julia/packages/ODE/OyDLv/src/ODE.jl:386
 [2] #ode4s_s#27 at /home/jeff/.julia/packages/ODE/OyDLv/src/ODE.jl:432 [inlined]
 [3] ode4s_s(::Function, ::Float64, ::Array{Float64,1}) at /home/jeff/.julia/packages/ODE/OyDLv/src/ODE.jl:432

The getfield elim pass was treating a GlobalRef as literal data and fetching the Symbol out of it. That was exposed by #32437, which allowed inlining the resulting Symbol constant.