InvalidIRError: hide GC intrinsics

When there's actual useful frames to report, the GC ones are pretty much irrelevant:

```
julia> map(i->evalpoly(i,p.coefficients), cux)
ERROR: InvalidIRError: compiling MethodInstance for (::GPUArrays.var"#broadcast_kernel#34")(::CUDA.CuKernelContext, ::CuDeviceVector{…}, ::CartesianIndices{…}, ::Base.Broadcast.Broadcasted{…}, ::Int64) resulted in invalid LLVM IR
Reason: unsupported call to an unknown function (call to julia.new_gc_frame)
Stacktrace:
[1] _broadcast_getindex_evalf
@ ./broadcast.jl:709
[2] _broadcast_getindex
@ ./broadcast.jl:682
[3] getindex
@ ./broadcast.jl:636
[4] broadcast_kernel
@ ~/Julia/pkg/GPUArrays/src/host/broadcast.jl:62
Reason: unsupported call to an unknown function (call to julia.push_gc_frame)
Stacktrace:
[1] _broadcast_getindex_evalf
@ ./broadcast.jl:709
[2] _broadcast_getindex
@ ./broadcast.jl:682
[3] getindex
@ ./broadcast.jl:636
[4] broadcast_kernel
@ ~/Julia/pkg/GPUArrays/src/host/broadcast.jl:62
Reason: unsupported call to an unknown function (call to julia.get_gc_frame_slot)
Stacktrace:
[1] _broadcast_getindex_evalf
@ ./broadcast.jl:709
[2] _broadcast_getindex
@ ./broadcast.jl:682
[3] getindex
@ ./broadcast.jl:636
[4] broadcast_kernel
@ ~/Julia/pkg/GPUArrays/src/host/broadcast.jl:62
Reason: unsupported dynamic function invocation (call to getproperty)
Stacktrace:
[1] #34
@ ./REPL[25]:1
[2] _broadcast_getindex_evalf
@ ./broadcast.jl:709
[3] _broadcast_getindex
@ ./broadcast.jl:682
[4] getindex
@ ./broadcast.jl:636
[5] broadcast_kernel
@ ~/Julia/pkg/GPUArrays/src/host/broadcast.jl:62
Reason: unsupported dynamic function invocation (call to evalpoly)
Stacktrace:
[1] #34
@ ./REPL[25]:1
[2] _broadcast_getindex_evalf
@ ./broadcast.jl:709
[3] _broadcast_getindex
@ ./broadcast.jl:682
[4] getindex
@ ./broadcast.jl:636
[5] broadcast_kernel
@ ~/Julia/pkg/GPUArrays/src/host/broadcast.jl:62
Reason: unsupported call to an unknown function (call to julia.pop_gc_frame)
Stacktrace:
[1] _broadcast_getindex_evalf
@ ./broadcast.jl:709
[2] _broadcast_getindex
@ ./broadcast.jl:682
[3] getindex
@ ./broadcast.jl:636
[4] broadcast_kernel
@ ~/Julia/pkg/GPUArrays/src/host/broadcast.jl:62
```

However, we can't always hide them, as it's possible that there's GC operations without type instabilities (as commonly encountered with escaping `StaticArray`s).

Reproduce the shown Julia expression and inspect the InvalidIRError diagnostic path using the stacktrace entries in broadcast.jl and GPUArrays/src/host/broadcast.jl. Determine when GC intrinsic frames can be omitted without hiding GC operations caused by type instability or escaping StaticArrays. Done means useful frames remain visible while irrelevant GC frames are suppressed.

Written by the indexing model from the issue text.