Use new ZPP and inline caches in ReflectionProperty::getValue() and variants

[arnaud-lb]

Apply the following changes to ReflectionProperty::getValue(), ::getRawValue(), ::isInitialized(), ::setValue(), ::setRawValue():

• Pass a cache slot to the property handler
• Inline the simple case of fetching a declared property
• Use the new parameter parsing API

This results in run time decrease of 12% to 59% in micro benchmarks, when executed with hyperfine -L version base,opt "/tmp/{version}/sapi/cli/php -d opcache.enable_cli=1 $script":

get-raw-value.php:   -58%
get-value-dyn.php:   -50%
get-value-hook.php:  -47%
get-value.php:       -59%
is-initialized.php:  -59%
set-value.php:       -11%

And a 1.8% decrease in this Doctrine benchmark: arnaud-lb/symfony-demo@5058252...reflection-property-get-value-opt

[TimWolla]

Related to #16329.

[nielsdos]

That's cool

[nielsdos]

Not that it actually matters, but I'm curious why you didn't just do Z_ISUNDEF_P and instead go through the type info

[arnaud-lb]

This is a copy of the happy path of ZEND_FETCH_OBJ_R here:

php-src/Zend/zend_vm_def.h

Lines 2073 to 2076 in 3967b7a

	if (EXPECTED(IS_VALID_PROPERTY_OFFSET(prop_offset))) {
	ZEND_VM_C_LABEL(fetch_obj_r_simple):
	retval = OBJ_PROP(zobj, prop_offset);
	if (EXPECTED(Z_TYPE_INFO_P(retval) != IS_UNDEF)) {

I think the original code uses Z_TYPE_INFO_P() rather than Z_TYPE_P()/Z_ISUNDEF_P() because type_info is accessed again just after. Here it's not the case, and Z_TYPE_INFO_P() != IS_UNDEF generates similar code as !Z_ISUNDEF_P(), so I could switch to Z_ISUNDEF_P().