RFR 8075230 Optimized count operations incorrectly declare the stream shape

[Paul Sandoz]

Hi,

This is a fix for a silly regression introduced with JDK-8067969 (optimized 
count operations) that i should have caught in review.

  http://cr.openjdk.java.net/~psandoz/jdk9/JDK-8075230-count-prims-shape/webrev/

The count operations for int, long and double incorrectly declare a stream 
shape of reference. This causes tests to fail when assertions are enabled.

Thanks,
Paul.