Add opcache.jit=tracing|function values, make on/yes/true synonym for tracing.

Implement named parameters

From an engine perspective, named parameters mainly add three
concepts:

* The SEND_* opcodes now accept a CONST op2, which is the
argument nam

Implement named parameters

From an engine perspective, named parameters mainly add three
concepts:

* The SEND_* opcodes now accept a CONST op2, which is the
argument name. For now, it is looked up by linear scan and
runtime cached.
* This may leave UNDEF arguments on the stack. To avoid having
to deal with them in other places, a CHECK_UNDEF_ARGS opcode
is used to either replace them with defaults, or error.
* For variadic functions, EX(extra_named_params) are collected
and need to be freed based on ZEND_CALL_HAS_EXTRA_NAMED_PARAMS.

RFC: https://wiki.php.net/rfc/named_params

Closes GH-5357.

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Remove more unused func_info fields

Check for EG(exception) after leaving function frame

Replace ZEND_JIT_TRACE_MAX_EXIT_COUNTERS constant by opcache.jit_max_exit_counters configuration directive

Automatically enable DASM_CHECKS in debug mode

Emit diagnostic on dasm_link() failure

Implement nullsafe ?-> operator

RFC: https://wiki.php.net/rfc/nullsafe_operator

Closes GH-5619.

Co-authored-by: Nikita Popov <nikita.ppv@gmail.com>

Allow keeping result of FETCH_DIM_R in CPU register

Fixed bug #79864 (JIT segfault in Symfony OptionsResolver)

cleanup

Tracing JIT for SWITCH instructions

JIT for array merging

Implement match expression

RFC: https://wiki.php.net/rfc/match_expression_v2

Closes GH-5371.

Make tracing JIT to support operator overloading independently from opcache.optimization_level ini directive.

Support JIT jumptables on x64

JIT support for opcache restart

Use information about recorded classes for speculative FETCH_OBJ optimization

Improve "VirtualProtect() failed" error messages

When `mprotect()` fails, the error message contains `errno` and the
respective `strerror()`; we add basically the same info on Windows.

Improve tracing JIT for FETCH_THIS + FETCH_OBJ_*

JIT for FETCH_OBJ_W

Use guards for ZEND_FETCH_OBJ_R/IS to eliminate repeatable checks

Use ZEND_UNREACHABLE() instead of ZEND_ASSERT(0)

Instead of marking unreachable code with `ZEND_ASSERT(0)`, we introduce
`ZEND_UNREACHABLE()`, so that MSVC which does not consider `asser

Use ZEND_UNREACHABLE() instead of ZEND_ASSERT(0)

Instead of marking unreachable code with `ZEND_ASSERT(0)`, we introduce
`ZEND_UNREACHABLE()`, so that MSVC which does not consider `assert(0)`
to mark unreachable code does no longer trigger C4715[1] warnings in
debug builds. This may be useful for other compilers as well.

[1] <https://docs.microsoft.com/de-de/cpp/error-messages/compiler-warnings/compiler-warning-level-1-c4715?view=vs-2019>

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Tracing JIT support for PHP references in array related instructions

Fix printf type