ci: also split x86_64-gnu-nopt

Author: pietroalbini

.azure-pipelines/auto.yml

@@ -168,8 +168,12 @@ jobs:
       x86_64-gnu-debug:
         IMAGE: x86_64-gnu-debug
 
-      x86_64-gnu-nopt:
+      x86_64-gnu-nopt-1:
         IMAGE: x86_64-gnu-nopt
+        SCRIPT: make ci-subset-1
+      x86_64-gnu-nopt-2:
+        IMAGE: x86_64-gnu-nopt
+        SCRIPT: make ci-subset-2
 
       x86_64-gnu-distcheck-1:
         IMAGE: x86_64-gnu-distcheck