<rdar://problem/9141269>

Cleaned up the objective C name parsing code to use a class.

Now breakpoints that are set by name that are objective C methods without the leading '+' or '-' will resolve. We do this by expanding all the objective C names for a given string. For example:

(lldb) b [MyString cStringUsingEncoding:]

Will set a breakpoint with multiple possible names:
-[MyString cStringUsingEncoding:]
+[MyString cStringUsingEncoding:]

Also if you have a category, it will strip the category and set a breakpoint in all variants:

(lldb) [MyString(my_category) cStringUsingEncoding:]

Will resolve to the following names:

-[MyString(my_category) cStringUsingEncoding:]
+[MyString(my_category) cStringUsingEncoding:]
-[MyString cStringUsingEncoding:]
+[MyString cStringUsingEncoding:]

Likewise when we have:

(lldb) b -[MyString(my_category) cStringUsingEncoding:]

It will resolve to two names:
-[MyString(my_category) cStringUsingEncoding:]
-[MyString cStringUsingEncoding:]