[Patch, GCC] Fix a condition post r278611

[Sudakshina Das]

Hi

While looking at vect_model_reduction_cost function, it seems Richard's 
change in a recent commit r278611 missed an update to the following if 
condition. Since the check for EXTRACT_LAST_REDUCTION is now split 
above, the same check in the if condition will never be true.

gcc/ChangeLog

2019-xx-xx  Sudakshina Das  <sudi.das@arm.com>

	* tree-vect-loop.c (vect_model_reduction_cost): Remove
	reduction_type check from if condition.

Is this ok for trunk?

Thanks
Sudi
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