Removed the increment specialization for integer addition.

Author: aardvark179

src/main/java/org/truffleruby/core/numeric/IntegerNodes.java

@@ -107,12 +107,7 @@ public abstract static class AddNode extends BignumCoreMethodNode {
 
         public abstract Object executeAdd(Object a, Object b);
 
-        @Specialization(guards = "b == 1", rewriteOn = ArithmeticException.class)
-        public int incInt(int a, int b) {
-            return Math.incrementExact(a);
-        }
-
-        @Specialization(rewriteOn = ArithmeticException.class, replaces = "incInt")
+        @Specialization(rewriteOn = ArithmeticException.class)
         public int add(int a, int b) {
             return Math.addExact(a, b);
         }