Add way to pass generator object to opcode handlers

The generator zval is put into the return_value_ptr_ptr.

Add support for executing a zend_execute_data

This adds another function execute_ex(), which accepts a zend_execute_data
struct to run (contrary to execute(), which accepts a zend_op_arr

Add support for executing a zend_execute_data

This adds another function execute_ex(), which accepts a zend_execute_data
struct to run (contrary to execute(), which accepts a zend_op_array from
which it initialized the execute_data).

This needs a bit more cleanup.

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Add dummy Iterator implementation

This simply adds dummy rewind/valid/current/key/next methods to Generator.

Add initial code for suspending execution

This is just some initial code, which is still quite broken (and needs to be
moved so it can be reused.)

Add some boilerplate code for Generator class

The Generator class now uses a zend_generator struct, so it'll be able to
store additional info.

This commit also ensures that Gene

Add some boilerplate code for Generator class

The Generator class now uses a zend_generator struct, so it'll be able to
store additional info.

This commit also ensures that Generator cannot be directly instantiated
and extended. The error tests are now in a separate folder from the
(yet-to-come) functional tests.

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Add empty Generator class