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* bidi.c (bidi_cache_size): Now EMACS_INT, not size_t.
(elsz): Now a signed constant, not a size_t var.  We prefer signed
types to unsigned, to avoid integer comparison confusion.  Without
this change, GCC 4.6.1 with -Wunsafe-loop-optimizations complains
"cannot optimize loop, the loop counter may overflow", a symptom
of the confusion.