Reverse mode: `ijl_eqtable_put` via `task_local_storage` blocks CuArray reductions

[rsenne]

Reverse-mode differentiation of a CuArray reduction fails on the scalar-indexing
guard in GPUArraysCore, which reads/writes task_local_storage.

using CUDA, Enzyme

f(x) = sum(abs2, x)
x = CuArray(randn(Float32, 8))
Enzyme.gradient(set_runtime_activity(Reverse), f, x)

EnzymeNoDerivativeError:
No create nofree of empty function (ijl_eqtable_put) ijl_eqtable_put)
 at context:   call fastcc void @julia_task_local_storage_16473(i32 zeroext 0) #929, !dbg !1032 (julia_task_local_storage_16473)

Stacktrace:
 [1] macro expansion
   @ GPUArraysCore/src/GPUArraysCore.jl:205
 [2] #_mapreduce#48
   @ GPUArrays/src/host/mapreduce.jl:88

Failure within method:
var"#_mapreduce#48"(::Colon, ::Nothing, ::typeof(GPUArrays._mapreduce), ::typeof(abs2),
                    ::typeof(Base.add_sum), ::CuArray{Float32, 1, CUDA.DeviceMemory})
     @ GPUArrays GPUArrays/src/host/mapreduce.jl:40