Preallocate hash tables of required size

Use better hash functions

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

master renames phase 2

master renames phase 1

basic macro replacements, all at once

Add copyright header

Remove old version PHP supports

update zend_make_printable_zval to take TSRM context

Implemented builtin instruction for strlen()

Changed zend_make_printable_zval() to return "use_copy" instead of additional reference argument.
Improved branch prediction.

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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Code cleanup

Use arena allocator for optimizer temporary data structures

Fixed new hash API usage

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

Split IS_BOOL into IS_FALSE and IS_TRUE

Fixed compilation warnings

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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Cleanup (2-nd round)

Fixed 0 index handling

Fixed optimizer (incomplete)

Optimizer related fixes (incomplete)

ext/opcache refactoring (incomplete)