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

Allow counter settings to be "zero" to disable corresponding counter

Tracing JIT SHM data initilaizarion must be done at MINIT

Make number of root and side traces configurable

Make JIT parameters configurable through opcache.jit_... options