Remove ZEND_ACC_INTERACTIVE and CG(interactive)

As far as I can discern these are leftovers of the interactive
shell implementation that was used before PHP 5.4. Now the readline
ext

Remove ZEND_ACC_INTERACTIVE and CG(interactive)

As far as I can discern these are leftovers of the interactive
shell implementation that was used before PHP 5.4. Now the readline
ext makes use of normal eval calls for this.

So, dropping these until there is evidence to the contrary, as they
currently wouldn't work anyway.

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master renames phase 2

master renames phase 1

ported opcache

basic macro replacements, all at once

Remove old version PHP supports

Fixed bug #67725 (now we create immutable arrays only in SHM)

Implemented builtin instruction for strlen()

ZEND_SEND_VAR and ZEND_SEND_VAL specialization

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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Use arena allocator for optimizer temporary data structures

Use absolute addresses as branch targets for NEW, FE_RESET and FE_FETCH

Simplified and optimized ZEND_HANDLE_NUMERIC()

Introduced immutable arrays. They don't need to be copyed and may be used directly from SHM.

Fixed issue #183 (TMP_VAR is not only used once)

Fixed hack. now we may store numbers not as pointers.

Optimized JMPZNZ to avoid multiplication at runtime (may be it makes sense to use relative addresses everywere it'll lead to Position Independent Code)

Cleanup

Moved zend_literal->cache_slot right into zval.
It should be accessed using Z_CACHE_SLOT() macro.
zend_literal structure is removed.
API functions that accepted pointer to zend_literal no

Moved zend_literal->cache_slot right into zval.
It should be accessed using Z_CACHE_SLOT() macro.
zend_literal structure is removed.
API functions that accepted pointer to zend_literal now accept pointer to zval or cache_slot directly.
Calls of such functiond that now accept cache_slot need to be changed to pass -1 instead of NULL.

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Refactored ZVAL flags usage to simplify various checks (e.g. Z_REFCOUNTED(), candidate for GC, etc)

Fixed optimizer

Optimizer related fixes (incomplete)

ext/opcache refactoring (incomplete)

Use better data structures (incomplete)

Bump year