unsafe fn slot_at_index(
        &mut self,
        builder: LLVMBuilderRef,
        slot_array: LLVMValueRef,
        index: LLVMValueRef,
    ) -> LLVMValueRef {
        LLVMBuildGEP(builder, slot_array, [index].as_mut_ptr(), 1, c_str!(""))
    }
Returns the slot pointer at a given index into the slot array.
weld/src/codegen/llvm2/dict.rs