Improve optimizer support for class constants (#13438)

The following optimizations are added:

- Constant folding of final class constants
- Type inference of typed class constan

Improve optimizer support for class constants (#13438)

The following optimizations are added:

- Constant folding of final class constants
- Type inference of typed class constants

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zend_compiler, ...: use `uint8_t` instead of `zend_uchar` (#10621)

`zend_uchar` suggests that the value is an ASCII character, but here,
it's about very small integers. This is misleadi

zend_compiler, ...: use `uint8_t` instead of `zend_uchar` (#10621)

`zend_uchar` suggests that the value is an ASCII character, but here,
it's about very small integers. This is misleading, so let's use a
C99 integer instead.

On all architectures currently supported by PHP, `zend_uchar` and
`uint8_t` are identical. This change is only about code readability.

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Make various pointers const in Zend/ (#10608)

* Zend/zend_operators: pass const pointers to zend_is_identical()

* Zend/zend_operators: pass const pointers to zend_get_{long,double}(

Make various pointers const in Zend/ (#10608)

* Zend/zend_operators: pass const pointers to zend_is_identical()

* Zend/zend_operators: pass const pointers to zend_get_{long,double}()

* Zend/Optimizer/sccp: make pointers const

* Zend/Optimizer/scdf: make pointers const

* Zend/Optimizer/zend_worklist: make pointers const

* Zend/Optimizer/zend_optimizer: make pointers const

* Zend/zend_compile: make pointers const

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Remove custom alloca() (#8513)

* Use arena in DCE instead of multiple alloca()
This requires passing the optimizer context

* Use our do_alloca() instead of alloca()

*

Remove custom alloca() (#8513)

* Use arena in DCE instead of multiple alloca()
This requires passing the optimizer context

* Use our do_alloca() instead of alloca()

* Use emalloc in DEBUG builds instead of stack allocations for do_alloca()
This helps detecting that we correctly free do_alloca()

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Add helper for convertion to CHECK_VAR/FREE/NOP

This is a recurring pattern whenever an instruction with an
operand is deleted.

Extract special function evaluation from pass1

Pass1 handles a number of special functions that can be evaluated
under some circumstances. Move the core logic into a separate
helper,

Extract special function evaluation from pass1

Pass1 handles a number of special functions that can be evaluated
under some circumstances. Move the core logic into a separate
helper, as I believe that SCCP should reuse this.

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Reuse get_class_entry_from_op1() helper

Export and reuse this helper in places that fetch a class entry
from op1.

Sink op_array scope case into get_class_entry()

This handles references to the current class through its name
rather than self (and for cases where is is not linked yet and
thus not

Sink op_array scope case into get_class_entry()

This handles references to the current class through its name
rather than self (and for cases where is is not linked yet and
thus not covered by the context lookup). Rather than handling this
only for FETCH_CLASS_CONSTANT optimization, integrate this into
the generic get_class_entry() utility.

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Use more appropriate types in Optimizer

Mainly using zend_result and bool instead of int

Extract helper for fetching class entry in optimizer

This code is repeated a few time. Two occurrences additionally
contained checks for user classes in CG(class_table) with the
same

Extract helper for fetching class entry in optimizer

This code is repeated a few time. Two occurrences additionally
contained checks for user classes in CG(class_table) with the
same file name, but as far as I know these should always be in
the script class_table, so I'm omitting the check here.

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Update http->https in license (#6945)

1. Update: http://www.php.net/license/3_01.txt to https, as there is anyway server header "Location:" to https.
2. Update few license 3.0 to 3.01 as

Update http->https in license (#6945)

1. Update: http://www.php.net/license/3_01.txt to https, as there is anyway server header "Location:" to https.
2. Update few license 3.0 to 3.01 as 3.0 states "php 5.1.1, 4.1.1, and earlier".
3. In some license comments is "at through the world-wide-web" while most is without "at", so deleted.
4. fixed indentation in some files before |

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Fix spelling and grammar mistakes

This PR corrects misspellings identified by the check-spelling action.

The misspellings have been reported at jsoref@b6ba3e2#commitcomment-48946465

Fix spelling and grammar mistakes

This PR corrects misspellings identified by the check-spelling action.

The misspellings have been reported at jsoref@b6ba3e2#commitcomment-48946465

The action reports that the changes in this PR would make it happy: jsoref@602417c

Closes GH-6822.

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Move optimizer into core

This only moves the files, adjusts the build system, exports APIs
and does minor fixups to make sure the code builds.

This does not yet try to make the

Move optimizer into core

This only moves the files, adjusts the build system, exports APIs
and does minor fixups to make sure the code builds.

This does not yet try to make the optimizer usable independently
of opcache.

Closes GH-6642.

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