rename isNilNil to isBoundless

Author: Nicolas Laurent

src/main/java/org/truffleruby/core/range/RangeNodes.java

@@ -360,7 +360,7 @@ protected Object boundedToA(RubyObjectRange range) {
             return toAInternalCall.call(range, "to_a_internal");
         }
 
-        @Specialization(guards = "range.isEndless() || range.isNilNil()")
+        @Specialization(guards = "range.isEndless() || range.isBoundless()")
         protected Object endlessToA(RubyObjectRange range) {
             throw new RaiseException(getContext(), coreExceptions().rangeError(
                     "cannot convert endless range to an array",
@@ -434,7 +434,7 @@ protected RubyIntRange beginlessObjectRange(RubyObjectRange range, RubyArray arr
                     end);
         }
 
-        @Specialization(guards = "range.isNilNil()")
+        @Specialization(guards = "range.isBoundless()")
         protected RubyIntRange nilNilObjectRange(RubyObjectRange range, RubyArray array) {
             int begin = 0;
             int end = array.size;
@@ -615,7 +615,7 @@ protected int[] normalizeBeginlessRange(RubyObjectRange range, int size,
             return normalize(0, toInt.execute(range.end), range.excludedEnd, size);
         }
 
-        @Specialization(guards = "range.isNilNil()")
+        @Specialization(guards = "range.isBoundless()")
         protected int[] normalizeNilNilRange(RubyObjectRange range, int size,
                 @Cached ToIntNode toInt) {
             return new int[]{ 0, size };

src/main/java/org/truffleruby/core/range/RubyObjectRange.java

@@ -29,7 +29,7 @@ public RubyObjectRange(RubyClass rubyClass, Shape shape, boolean excludedEnd, Ob
         this.end = end;
     }
 
-    public boolean isNilNil() {
+    public boolean isBoundless() {
         return begin == Nil.INSTANCE && end == Nil.INSTANCE;
     }