[Patch/RFA] Further speedup locale::operator==

[Paolo Carlini]

Martin Sebor wrote:

> PS Consider the program below (which runs successfully with
> our latest implementation):

Before further discussing your interesting reply: have you actually
tested this with libstdc++-v3? It works for me with 3.3.3, 3.4.0 and
mainline! I passed: "de_DE fr_FR", "fr_FR fr_FR", "".

Does this mean we (both v3 and RW) are not implementing the letter
of the current standard (for good ;) ?

Paolo.