Restrict the two sources of vect_recog_cond_expr_convert_pattern to be of the same...

Restrict the two sources of vect_recog_cond_expr_convert_pattern to be of the same type when convert is extension.

It's not equal to transform

 (cond (cmp @1 @2) (convert@3 @4) (convert@5 @6))

 to

 (convert (cmp @1 @2) (convert)@4 @6)

when(convert@3 @4) is extension because it's zero_extend vs sign_extend.

gcc/ChangeLog:

	PR tree-optimization/104551
	PR tree-optimization/103771
	* match.pd (cond_expr_convert_p): Add types_match check when
	convert is extension.
	* tree-vect-patterns.cc
	(gimple_cond_expr_convert_p): Adjust comments.
	(vect_recog_cond_expr_convert_pattern): Ditto.

gcc/testsuite/ChangeLog:

	* gcc.target/i386/pr104551.c: New test.