Port constant declaration

Port function/const use

Drop dead code

Dead code

Mostly finish class declarations (~50 failing tests)

Dead code

Dead code

Remove dead code

Improve fix for #66608

Remove bits of dead code

Fixed bug #66608 (Incorrect behavior with nested "finally" blocks)

Port parameter defs

Has one bug re \self

Moar removal

Remove more dead code

Remove dead code

Store (bad) estimate of lineno with ast

Currently not used yet

Implemented builtin instruction for strlen()

Port echo

Simplify call-frame handling

Fix ZTS build

Refactor class name resolution as well

Refactored parameter passing mechanism.

In PHP-5.6 and below each argument passed to user function was copies on VM stack twice.
Now we always have ZEND_INIT_FCALL (or simular) opcode th

Refactored parameter passing mechanism.

In PHP-5.6 and below each argument passed to user function was copies on VM stack twice.
Now we always have ZEND_INIT_FCALL (or simular) opcode that pushes "call frame" on top of VM stack.
"Call frame" is actually the same zend_execute_data structure.
All the following ZEND_SEND instructions push arguments on top of the stack in a way that they directly comes into corresponding CV variables of the called frame. Extra arguments are copied at the end of stack frame (after all CV and TMP variables) on function enterance.

There are two minor incompatibilities:
1) It's not allowed to decalre functions redefining arguments e.g. "function foo($a,$a) {}".
2) func_get_arg() and func_get args() return the current value of argument and not the original value that was sent.

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Some refactoring of fn/const resolution

Drop dead code

Implement constant expression folding as a separate pass