https://bugs.webkit.org/show_bug.cgi?id=83961

Patch by Benjamin Poulain <bpoulain@apple.com> on 2012-04-24
Reviewed by Eric Seidel.

Source/JavaScriptCore: 

Use the regular String::find(StringImpl*) in all cases now that it has been made faster.

* runtime/StringPrototype.cpp:
(JSC::replaceUsingStringSearch):

Source/WTF: 

This patch makes some improvment over String::find() in the case of lookup for a single
character.

The two function find(UChar|LChar) are replaced by a template.

The case of searching a UChar in a 8bit string has a shortcut if the UChar cannot
possibly match any character in the range of the type LChar.

The slow case StringImpl::find(StringImpl*) is modified to
-Do not allocate in the fast case if only one string is 8bit.
-Use the shortcut for searching UChar in LChar.

This speed up the function by about 7% when avoiding string conversion.

* wtf/text/StringImpl.cpp:
(WTF::StringImpl::find):
* wtf/text/StringImpl.h:
(StringImpl):
(WTF):
(WTF::find):
(WTF::StringImpl::find):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@115132 268f45cc-cd09-0410-ab3c-d52691b4dbfc