Fix iterators for one-element progressions

In case of start==end hasNext was always false, which resulted in iterators
over one-element progressions not iterating that element

runtime/src/jet/ByteProgressionIterator.java

@@ -29,7 +29,7 @@ class ByteProgressionIterator extends ByteIterator {
         this.increment = increment;
 
         this.finalElement = (byte) ProgressionUtil.getProgressionFinalElement(start, end, increment);
-        this.hasNext = increment < 0 ? start > end : start < end;
+        this.hasNext = increment > 0 ? start <= end : start >= end;
     }
 
     @Override

runtime/src/jet/CharProgressionIterator.java

@@ -29,7 +29,7 @@ class CharProgressionIterator extends CharIterator {
         this.increment = increment;
 
         this.finalElement = (char) ProgressionUtil.getProgressionFinalElement(start, end, increment);
-        this.hasNext = increment < 0 ? start > end : start < end;
+        this.hasNext = increment > 0 ? start <= end : start >= end;
     }
 
     @Override

runtime/src/jet/IntProgressionIterator.java

@@ -29,7 +29,7 @@ class IntProgressionIterator extends IntIterator {
         this.increment = increment;
 
         this.finalElement = ProgressionUtil.getProgressionFinalElement(start, end, increment);
-        this.hasNext = increment < 0 ? start > end : start < end;
+        this.hasNext = increment > 0 ? start <= end : start >= end;
     }
 
     @Override

runtime/src/jet/LongProgressionIterator.java

@@ -29,7 +29,7 @@ class LongProgressionIterator extends LongIterator {
         this.increment = increment;
 
         this.finalElement = ProgressionUtil.getProgressionFinalElement(start, end, increment);
-        this.hasNext = increment < 0 ? start > end : start < end;
+        this.hasNext = increment > 0 ? start <= end : start >= end;
     }
 
     @Override

runtime/src/jet/ShortProgressionIterator.java

@@ -29,7 +29,7 @@ class ShortProgressionIterator extends ShortIterator {
         this.increment = increment;
 
         this.finalElement = (short) ProgressionUtil.getProgressionFinalElement(start, end, increment);
-        this.hasNext = increment < 0 ? start > end : start < end;
+        this.hasNext = increment > 0 ? start <= end : start >= end;
     }
 
     @Override