C++ PATCH for c++/50157 (hard error in SFINAE situation)

[Jason Merrill]

We weren't protecting all errors in convert_like_real with a complain 
check.  So this patch adds one at the top of the file to handle all 
bad_p cases.  The second patch then removes various checks in the rest 
of the function that are now redundant.

Tested x86_64-pc-linux-gnu, applying to trunk.  Also applying the first 
patch to 4.6.
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