Using strncmp() for comparing scheme and port numbers is inefficient

Using strncmp() for comparing scheme and port numbers is inefficient
https://bugs.webkit.org/show_bug.cgi?id=75821

Reviewed by Darin Adler.

Replace the equal() function comparing 2 arbitrary strings by a template
comparing the string to an array, character by character.

This is only used for small strings: the schemes and the ports.

* platform/KURL.cpp:
(WebCore::equal):
(WebCore::isDefaultPortForScheme):
(WebCore::isNonFileHierarchicalScheme):
(WebCore::isCanonicalHostnameLowercaseForScheme):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@106025 268f45cc-cd09-0410-ab3c-d52691b4dbfc