[GTK] WebKitWebProcess at 100% CPU loading hyphenation dictionaries

[GTK] WebKitWebProcess at 100% CPU loading hyphenation dictionaries
https://bugs.webkit.org/show_bug.cgi?id=165601

Reviewed by Carlos Garcia Campos.

In HyphenationLibHyphen, retrieve the canonicalized absolute pathname of the dictionary file
in order to avoid storing symbolic links as the target files for specific locales. libhyphen
distributes its dictionary files by linking a set of similar locales files to a single file.
Not resolving those symbolic links means we'll be opening a single file via multiple
HyphenationDictionary objects, which is far from optimal.

To add insult to injury, these HyphenationDictionary objects were stored in a TinyLRUCache
with a slim capacity of 4. This meant that while already loading one single file through
multiple symlinks, because of continuous eviciton from this LRU cache the same symlinks
continued to be processed, in some cases resulting in opening the same dictionary file
hundreds or thousands of times. The capacity of this TinyLRUCache is increased to 32
to keep the amount of open libhyphen dictionaries capped at some reasonable number.

* platform/text/hyphen/HyphenationLibHyphen.cpp:
(WebCore::scanDirectoryForDicionaries):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@210670 268f45cc-cd09-0410-ab3c-d52691b4dbfc