Function top_stack_or_undef

crates/rustc_codegen_spirv/src/linker/mem2reg.rs:414–424

(
    header: &mut ModuleHeader,
    types_global_values: &mut Vec<Instruction>,
    stack: &[Word],
    ty: Word,
)

    inst_id
}
fn top_stack_or_undef(
    header: &mut ModuleHeader,
    types_global_values: &mut Vec<Instruction>,
    stack: &[Word],
    ty: Word,
) -> Word {
    match stack.last() {
        Some(&top) => top,
        None => undef_for(header, types_global_values, ty),
    }
}

struct Renamer<'a> {
    header: &'a mut ModuleHeader,