typed_ccall doesn't support vararg ccalls

```julia
patchpoint(ptr, args...) = @typed_ccall("llvm.experimental.patchpoint.void", llvmcall, Cvoid, (Int64, Int32, Ptr{Int8}, Int32, Int64...), 1, Int32(8), ptr, Int32(0), args...)
ERROR: syntax: "..." expression outside call around /home/jpsamaroo/.julia/packages/LLVM/qc3sa/src/interop/pointer.jl:277
```