https://bugs.webkit.org/show_bug.cgi?id=123380

Reviewed by Geoffrey Garen.

Needed another linked-on-or-after check for when we're deciding whether
we should copy over init family methods.

Factored out the link time checks into a separate function so that they can be cached.

Factored out the check for init-family method selectors into helper function and changed it to
match the description in the clang docs, namely that there can be underscores at the beginning
and the first letter after 'init' part of the selector (if there is one) must be a capital letter.

Updated tests to make sure we don't treat "initialize" as an init-family method and that we do
treat "_init" as an init-family method.

* API/JSWrapperMap.h:
* API/JSWrapperMap.mm:
(isInitFamilyMethod):
(shouldSkipMethodWithName):
(copyMethodsToObject):
(allocateConstructorForCustomClass):
(supportsInitMethodConstructors):
* API/tests/testapi.mm:
(-[ClassA initialize]):
(-[ClassD initialize]):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@158762 268f45cc-cd09-0410-ab3c-d52691b4dbfc