[patch] Fix PR tree-optimization/86659

[Eric Botcazou]

> 2018-09-28  Eric Botcazou  <ebotcazou@adacore.com>
> 
> 	PR tree-optimization/86659
> 	* gimple-match.h (struct gimple_match_op): Add reverse field.

Jonathan privately remarked that the new member should probably be initialized 
in the constructors (thanks!).  Done thusly, applied on mainline as obvious.

	PR tree-optimization/86659
	* gimple-match.h (gimple_match_op constructors): Initialize reverse.

-- 
Eric Botcazou
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