Function only called at comptime is emitted to binary

[Vexu]

Both stage1 and stage2 will emit an error for foo because they try to emit is as a runtime function even though it is only ever used at comptime.

fn foo() void {
    var a = false;
    if (a) @compileError("analyzed as runtime");
}
comptime {
    _ = foo();
}

[andrewrk]

Duplicate of #6256.

Related:

• ability to mark functions as wanting to be comptime if possible #425
• Proposal: Inline Parameters #7772

Note that emitting a runtime version of the function makes it available for debuggers.