Cleanup and better register usage

Reduce amount of "cold" code generated for FETCH_OBJ_* instructions

Improve JIT for SEPARATE_ARRAY

Improve spill code

Avoid register spilling

Fixed JIT failures on Windows

JIT for FETCH_OBJ_W

MAY_BE_INDIRECT inference

Use guards for ZEND_FETCH_OBJ_R/IS to eliminate repeatable checks

Improved JIT for SEPARATE_ARRAY

Tracing JIT support for PHP references in ASSIGN instruction

cleanup

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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Merge exit points

Eliminate a dead check

Tracing JIT support for PHP references in array related instructions

Use "lea" to add/sub register with constant

Improved JIT for ZVAL_COPY_DEREF

Fixed JIT

Change GC_COLLECTABLE flag into GC_NOT_COLLECTABLE to simplify GC_MAY_LEAK() check

FETCH_FIM_R/IS JIT improvement

Use cheaper variant of zend_hash_index_find()

Tracing JIT support for megamorphic calls

Tracing JIT support for real dynamic calls

Fixed incorrect zend_bool type usage