Fixed register allocation

Improve register allocator (give preference to loop variables).

Give preference to live-ranges with register hints to improve register reuse.

Keep the same JIT code for PHP-8.0 and master (workaround against PHP-8.0 ABI freeze)

Eliminate dead type stores

Add more hints for register allocator

Optimize out double memory load

Use range inference to eliminate useless comparisons

Copy optimization for (BINARY_OP/ACCIGN + SEND_VAL)

Clenup BINARY_OP + SEND_VAL optimization

Tracing JIT support for preloaded scripts

Keep track information about used JIT trigger in ZEND_FUNC_INFO(op_array)->func_info.flags

Add system ID entropy API

The `zend_system_id` is a (true global) system ID that fingerprints a process state. When extensions add engine hooks during MINIT/startup, entropy is added the sys

Add system ID entropy API

The `zend_system_id` is a (true global) system ID that fingerprints a process state. When extensions add engine hooks during MINIT/startup, entropy is added the system ID for each hook. This allows extensions to identify that changes have been made to the engine since the last PHP process restart.

Closes GH-5871

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Cleanup observer API and add JIT support

Remove support for EXT_NOP

This is an annoying edge case that regularly gets broken. As we're
not aware of significant users of this API, and there are other
ways to hook this, remov

Remove support for EXT_NOP

This is an annoying edge case that regularly gets broken. As we're
not aware of significant users of this API, and there are other
ways to hook this, remove support for EXT_NOP.

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Support for ZEND_COMPILE_EXTENDED_STMT

Fixed incorrect live-range construction

JIT for INIT_METHOD_CALL

Tracing JIT for INIT_DYNAMIC_CALL (closure only)

Support for reference

JIT for PRE/POST_INC/DEC_OBJ

JIT for ASSIGN_OBJ_OP

Remove @jit Docblock support for now due to dev-time constraints

JIT for ASSIGN_OBJ

Pass correct op_info to zend_jit_fetch_dim()