cgen: return if multi-return with bare function value uses function name as type #22

Description

A multi-return expression of type (T, fn () ...) fails when a bare function value flows through a return if expression. The generated multi-return struct field type is built from the function symbol name instead of the function type.

Using the function value in both branches is enough to trigger the issue.

Reproduction

module main

fn noop_cmd() int {
    return 0
}

fn update(cond bool) (int, fn () int) {
    return if cond {
        1, noop_cmd
    } else {
        2, noop_cmd
    }
}

fn main() {
    a, c := update(true)
    println(a)
    println(c())
}

Actual Result

C compilation fails because the generated code treats main__noop_cmd as a type name:

error: unknown type name 'main__noop_cmd'
  main__noop_cmd arg1;

In the original report, the same pattern produced bobatea__noop_cmd.

Expected Result

The program should compile, return the function value as fn () int, and print:

1
0

Repro Status

Reproduced on origin/master at a72a784ee, after #27342 was merged.

Original bugs.vlang.io source cluster: lilly app + bobatea TUI module.

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