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

Added JIT debug flag to dump the size of generated code (opcache.jit_debug=0x200)

Fixed tracing JIT support for ZEND_RETURN_BY_REF in CALL VM

Fixed JIT for ext/opcache/tests/jit/cmp_004.phpt with opcache.jit=1201

Set proper jit_extension for inherited methods

Let's try to fix the JIT compiler warning

Fixed JIT for integer overflow checks

Reorder conditions to save one instruction in recursive return loop