Fix GH-11715: opcache.interned_strings_buffer either has no effect or opcache_get_status() / phpinfo() is wrong

There are a couple of oddities.

1) The interned strings buffer compri

Fix GH-11715: opcache.interned_strings_buffer either has no effect or opcache_get_status() / phpinfo() is wrong

There are a couple of oddities.

1) The interned strings buffer comprises the whole hashtable
datastructure.
Therefore, it seems that the interned strings buffer size is the size of
only said table. However, in the current code it also includes the size
of the zend_accel_shared_globals.

2) ZCSG(interned_strings).end is computed starting from the accelerator
globals struct itself. I would expect it to start from the part where
the interned strings table starts.

3) When computing the used size, it is done using
ZCSG(interned_strings).end - ZCSG(interned_strings).start. However,
this does not include the uin32_t slots array because
ZCSG(interned_strings).start pointers after that array.

This patch corrrects these 3 points.

Closes GH-11717.

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