Add extra VM operand specialization

For now RETVAL and OP_DATA= are supported

Consolidate op1/op2 vm flags

Merge branch 'PHP-7.0'

bump year which is missed in rev 49493a2

Remove uses of VARs in extended_value

The DECLARE_(ANON_)INHERITED_CLASS(_DELAYED) opcodes were
referencing the parent ce VAR through extended_value. This is
hacky and we can't track

Remove uses of VARs in extended_value

The DECLARE_(ANON_)INHERITED_CLASS(_DELAYED) opcodes were
referencing the parent ce VAR through extended_value. This is
hacky and we can't track the def-use chain in SSA.

To avoid this, the layout of declaration opcodes is changed
as follows: op1 points to the lcname and rtd_key literals, in
that order. (For anon/lambda declarations only one of lcname or
rtd_key is present.) This frees up op2, which is now used to
reference the parent ce VAR in inheriting declarations. The
jmp offset for anon class declarations is moved frop op2 to
extended_value.

The changes were applied both to class and function declarations
to keep everything symmetric.

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Describe special meaning of IS_UNUSED oprerand

Use more compact description encoding schema to free some bits

Improve Optimizer debugging facility (print the meaning of extended_value)

Improved specializer:

- Allow dispatching from specialized handler to unspecialized one

Improved specializer (Bob)

- All helpers now may be declatred and called without ZEND_VM_HELPER_EX() and ZEND_VM_DISPATCH_TO_HELPER_EX() macros
- ZEND_VM_HELPER() may declare few argumen

Improved specializer (Bob)

- All helpers now may be declatred and called without ZEND_VM_HELPER_EX() and ZEND_VM_DISPATCH_TO_HELPER_EX() macros
- ZEND_VM_HELPER() may declare few arguments
- ZEND_VM_DISPATCH_TO_HELPER() may pass few parameters
- ZEND_VM_INLINE_HELPER() may be used to declare inline helpers (it won't be inlined in SWITH/GOTO executors)

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Changed ZEND_FREE.op2.num and ZEND_FE_FREE.op2.num back to use live_range_offset (try_catch_offset does't work)

Changed meaning of "op2" for ZEND_FREE, ZEND_FE_FREE, ZEND_FAST_CALL, ZEND_FAST_RET.
Previously it was an instruction number.
Now it's an index in op_array->try_cacth_array[].

Changed ZEND_CLONE->extended_value meaning to relative offset (previously it was absolute opline number)

Argument type renaming (ADDR->JMP_ADDR, OPLINE->JMP_ABS, REL_OPLINE->JMP_REL)

Fixed few issues:

- Added ZEND_VM_LAST_OPCODE macro
- Use better names LINE->OPLINE, REL_LINE->REL_OPLINE, FCALL->FAST_CALL, FRET->FAST_RET
- Added ISSET flag to extended value of ZE

Fixed few issues:

- Added ZEND_VM_LAST_OPCODE macro
- Use better names LINE->OPLINE, REL_LINE->REL_OPLINE, FCALL->FAST_CALL, FRET->FAST_RET
- Added ISSET flag to extended value of ZEND_ISSET_ISEMPTY_VAR opcode

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Added zend_get_opcode_flags() function to get information about opcode operands and extended_value meaning

Allow an experimental VM with tail call dispatch technique (disabled by default).
This VM may work only if all tail calls are optimized, otherwaise it will crach because of stack overflow.
Un

Allow an experimental VM with tail call dispatch technique (disabled by default).
This VM may work only if all tail calls are optimized, otherwaise it will crach because of stack overflow.
Unfortunately, we can't guarantee tail call optimization in C.

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Suppressed warning -Wvolatile-register-var

Fix zend_vm_call_opcode_handler (e.g. Generators throwing exceptions) with IP/FP registers

Assign CPU registers for GOTO and SWITCH executor as well

Removed deprecated comments and added expectations (overloaded properties and array elements are less frequently used than regular ones)

Revert "Simplify ZEND_EXIT and count boolean values to it as exit status"

This reverts commit 7c003948c618adb2a6691f529057388f02202f09.

Simplify ZEND_EXIT and count boolean values to it as exit status

Fixed typo

Improve the conditions(save one comparison)