Function llvm_fixup_input 

fn llvm_fixup_input<'ll, 'tcx>(
    bx: &mut GenericBuilder<'_, 'll, FullCx<'ll, 'tcx>>,
    value: Value<'ll>,
    reg: InlineAsmRegClass,
    layout: &TyAndLayout<'tcx>,
    instance: Instance<'_>,
) -> Value<'ll>

Fix up an input value to work around LLVM bugs.