unnecessary 1 byte allocted

Fix RECV_VARIADIC literal compacting wrt cache slot

Use ZSTR_ API to access zend_string elements (this is just renaming without semantick changes).

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Improved class type hints checks, by caching resolved class entries in run-time cache.

Fixed build with DEBUG_COMPACT_LITERALS=1

Use cache_slot offsets instead of indexes (simplify run-time instructions)

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

bump year

first shot remove TSRMLS_* things

Embed FETCH_CLASS <string> into the following NEW

Embed FETCH_CLASS <string> into the following INSTANCEOF

Use runtime-cache to avoid hash lookups in BIND_GLOBAL instruction

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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