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* expmed.c (const_mult_add_overflow_p): New.
* expr.h: Declare it.
* loop.c (maybe_eliminate_biv_1) [COMPARE]: Use it.
Don't eliminate the biv if the giv has a constant multiplier and
the rhs argument of the comparison does satisfy the predicate.
Use expand_mult_add to compute the replacement constant.
From-SVN: r54075
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