C++ PATCH for c++/41754 (ice with init-lists)

[Jason Merrill]

In a case where we end up comparing two identical conversions to 
std::initializer_list, we were falling into code that looked at u.next, 
which is invalid for ck_list conversions.  Fixed by just returning if we 
have two list conversions of the same rank.

Tested x86_64-pc-linux-gnu, applying to trunk and 4.4.
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