[PATCH GCC]By pass following iterations if expr has already been simplified into const.

[Bin Cheng]

Hi,
This is an obvious change to bypass following iterations if expr has already
been simplified into constant in function
simplify_using_loop_initial_conditions.

Is it OK?

Thanks,
bin

2015-07-28  Bin Cheng  <bin.cheng@arm.com>

	* tree-ssa-loop-niter.c (simplify_using_initial_conditions): Break
	Loop if EXPR is simplified to const values.
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