addVariable

pub fn addVariable(
    self: *Builder,
    name: StrtabString,
    ty: Type,
    addr_space: AddrSpace,
) Allocator.Error!Variable.Index {
    assert(!name.isAnon());
    try self.ensureUnusedTypeCapacity(1, NoExtra, 0);
    try self.ensureUnusedGlobalCapacity(name);
    try self.variables.ensureUnusedCapacity(self.gpa, 1);
    return self.addVariableAssumeCapacity(ty, name, addr_space);
}