re PR tree-optimization/77503 (ICE in vect_transform_stmt compiling postgresql)

re PR tree-optimization/77503 (ICE in vect_transform_stmt compiling postgresql)

	PR tree-optimization/77503
	* tree-vect-loop.c (vectorizable_reduction): Record reduction
	code for CONST_COND_REDUCTION at analysis stage and use it at
	transform stage.
	* tree-vectorizer.h (struct _stmt_vec_info): New field.
	(STMT_VINFO_VEC_CONST_COND_REDUC_CODE): New macro.
	* tree-vect-stmts.c (new_stmt_vec_info): Initialize above new
	field.

	gcc/testsuite
	* gcc.dg/vect/pr77503.c: New test.

From-SVN: r240166