addVariableAssumeCapacity

pub fn addVariableAssumeCapacity(
    self: *Builder,
    ty: Type,
    name: StrtabString,
    addr_space: AddrSpace,
) Variable.Index {
    const variable_index: Variable.Index = @enumFromInt(self.variables.items.len);
    self.variables.appendAssumeCapacity(.{ .global = self.addGlobalAssumeCapacity(name, .{
        .addr_space = addr_space,
        .type = ty,
        .kind = .{ .variable = variable_index },
    }) });
    return variable_index;
}