Remove ZEND_VM_EXPORT functionality

This hasn't been used since forever and makes things more confusing
than they already are.

[ci skip] Various typo fixes in stub comments and CHANGES file

Prevent CGG reordering if hanlers order is defined by zend_vm_order.txt

Remove spurious const qualifier from function return type

Merge branch 'PHP-7.4'

* PHP-7.4:
Apply tidy formatting

Apply tidy formatting

Mostly reindent PHP scripts to spaces.

Support the same handler for multiple opcodes

Optimize int === int/double === double

Do this by reusing the implementation used for `==`
when both arguments are ints (IS_LONG) or both are floats (IS_DOUBLE)

```php
// Be

Optimize int === int/double === double

Do this by reusing the implementation used for `==`
when both arguments are ints (IS_LONG) or both are floats (IS_DOUBLE)

```php
// Before: nestedloop_ni took 0.442 seconds
// After: nestedloop_ni takes 0.401 seconds (same as nestedloop_ne)
function nestedloop_ni(int $k) {
$x = 0;
for ($i=0; $i < 50000000; $i++) {
if ($i === $k) {
$x++;
}
}
print "$x\n";
}
function nestedloop_ne(int $k) {
$x = 0;
for ($i=0; $i < 50000000; $i++) {
if ($i == $k) {
$x++;
}
}
print "$x\n";
}
```

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SAMRT BRANCH improvement.

Avoid need of insertion NOP opcoes between unrelated SMART BRANCH instruction and following JMPZ/JMPNZ.
Now instead of checking the opcode of following instruct

SAMRT BRANCH improvement.

Avoid need of insertion NOP opcoes between unrelated SMART BRANCH instruction and following JMPZ/JMPNZ.
Now instead of checking the opcode of following instruction, the same information is encoded into SMART BRANH result_type.

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Encapsulate all SMART BRANCH related logic inside macros. Result of SMART BRANCH may be uninitialized (on exception).

Throw Error when writing property of non-object

This removes object auto-vivification support.

This also means that we can remove the corresponding special
handling for typed pr

Throw Error when writing property of non-object

This removes object auto-vivification support.

This also means that we can remove the corresponding special
handling for typed properites: We no longer need to check that a
property is convertible to stdClass if such a conversion might
take place indirectly due to a nested property write.

Additionally OBJ_W style operations now no longer modify the
object operand, and as such we no longer need to treat op1 as a
def in SSA form.

The next step would be to actually compile the whole LHS of OBJ_W
operations in R rather than W mode, but that causes issues with
SimpleXML, whose object handlers depend on the current compilation
structure.

Part of https://wiki.php.net/rfc/engine_warnings.

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Avoid code dupliction

ceanup

Merge branch 'PHP-7.4'

* PHP-7.4:
Remove HOT attribute from some VM handlers. Comparisons almost always followed by JMPZ/JMPNZ; JMPZNZ is rare used.
Remove --with-zlib-dir option

Merge branch 'PHP-7.4'

* PHP-7.4:
Remove HOT attribute from some VM handlers. Comparisons almost always followed by JMPZ/JMPNZ; JMPZNZ is rare used.
Remove --with-zlib-dir option from mysqlnd config

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Remove HOT attribute from some VM handlers. Comparisons almost always followed by JMPZ/JMPNZ; JMPZNZ is rare used.

Simplify TMP/VAR operand releasing

Try to fix macos build

By avoiding unused variable opline warnings. Also clean up the
replacement of ZEND_VM_SPEC -- we were sometimes treating it as
an always-defined constant with

Try to fix macos build

By avoiding unused variable opline warnings. Also clean up the
replacement of ZEND_VM_SPEC -- we were sometimes treating it as
an always-defined constant with a value (what it actually is) and
sometimes as a conditionally defined constant (which it isn't, but
which still worked thanks to the specializer). Switch to only
treating it as a constant with a value.

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Fixed CALL VM

Avoid extra specialization for cold opcodes

Remove old hack

Slit INC/DEC opcodes into hot/cold parts and remove specialized versioins for LONG_OR_DOUBLE.

Merge branch 'PHP-7.3' into PHP-7.4

* PHP-7.3:
Fixed incorrect specialization (missed IS_INDIRECT handling)

Merge branch 'PHP-7.2' into PHP-7.3

* PHP-7.2:
Fixed incorrect specialization (missed IS_INDIRECT handling)

Fixed incorrect specialization (missed IS_INDIRECT handling)

Allow GOTO style helpers in HYBRID VM