libc++ patch for LWG Issue 2232 - dangling reference for regex_iterators

[Marshall Clow]

Users can write 
	for(sregex_iterator i(s.begin(), s.end(), regex("meow")), end; i != end; ++i)

binding a temporary regex to const regex& and storing a pointer to it. 
This will compile silently, triggering undefined behavior at runtime. 

Fixing this involves defining constructors for the various regex iterator types from rvalue regexes, and then marking them as “deleted”.
And tests.

-- Marshall

Marshall Clow     Idio Software   <mailto:mclow.lists at gmail.com>

A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait).
        -- Yu Suzuki

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