checkasm/vf_blend : add test for 16 bit version of

grainextract
grainmerge
average
extremity
negation

tests/checkasm/vf_blend.c

@@ -124,9 +124,14 @@ void checkasm_check_blend(void)
     report("8bit");
 
     check_and_report(addition_16, BLEND_ADDITION, 2)
+    check_and_report(grainmerge_16, BLEND_GRAINMERGE, 2)
     check_and_report(and_16, BLEND_AND, 2)
+    check_and_report(average_16, BLEND_AVERAGE, 2)
     check_and_report(darken_16, BLEND_DARKEN, 2)
+    check_and_report(grainextract_16, BLEND_GRAINEXTRACT, 2)
     check_and_report(difference_16, BLEND_DIFFERENCE, 2)
+    check_and_report(extremity_16, BLEND_EXTREMITY, 2)
+    check_and_report(negation_16, BLEND_NEGATION, 2)
     check_and_report(lighten_16, BLEND_LIGHTEN, 2)
     check_and_report(or_16, BLEND_OR, 2)
     check_and_report(phoenix_16, BLEND_PHOENIX, 2)