Fixed bug #69159 (Opcache causes problem when passing a variable variable to a function)

Added specialized versions of DO_FCALL handler:
DO_ICALL - for internal functions
DO_UCALL - for user functions
DO_FCALL_BY_NAME - plain, most probably user, funcstions (not methods)

Split INIT_FCALL_BY_NAME inti INIT_FCALL_BY_NAME(CONST+STRING) and INIT_DYNAMIC_CALL(CONST-STRING|TMPVAR|CV)

bump year

trailing whitespace removal

first shot remove TSRMLS_* things

Make ZEND_INIT_FCALL keep predcalculted size of necessary stack space in opline->op1.num to avoid its recalculation on each execution.

SEND_VAR_NO_REF optimization

Refactored optimizer (compile different opimizer passes separately, instead of including *.c file)

Fixed incorrect ZEND_INIT_FCALL_BY_NAME -> ZEND_INIT_FCALL conversion

ZEND_INIT_FCALL_BY_NAME can have non-string literal

Add copyright header

Remove old version PHP supports

Implement call_user_func() and call_user_func_array() using special opcodes.
In some rare cases it leads to insignificant changes in error messages.

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

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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ext/opcache refactoring (incomplete)

We don't know PHP_5_6_X_API_NO yet

Fixed arguments unpacking segfault with opcache

Fix other typos & add test script

Fix typo

- Fixed ZTS build

Disable FCALL optimization pass for PHP older than 5.4