[Patch] Fix libstdc++/11740

[Paolo Carlini]

Hi,

in short, we failed to compute and return (M & m) != 0, as per 22.2.1.1.2.

Instead, essentially, we selected all the 1s in m, &&-ed each with the
corresponding bit in M and returned the && of all those, another thing.

Tested x86-linux. Ok??

Paolo.

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