Removed redundant specializations and improved guards in PermNode and CombNode

Author: otethal

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/MathModuleBuiltins.java

@@ -571,16 +571,6 @@ PInt comb(PInt n, PInt k) {
         }
 
         @Specialization
-        int comb(@SuppressWarnings("unused") double n, @SuppressWarnings("unused") Object k) {
-            throw raise(TypeError, ErrorMessages.OBJ_CANNOT_BE_INTERPRETED_AS_INTEGER, "float");
-        }
-
-        @Specialization
-        int comb(@SuppressWarnings("unused") Object n, @SuppressWarnings("unused") double k) {
-            throw raise(TypeError, ErrorMessages.OBJ_CANNOT_BE_INTERPRETED_AS_INTEGER, "float");
-        }
-
-        @Specialization(guards = "!isNumber(n) || !isNumber(k)")
         Object comb(VirtualFrame frame, Object n, Object k,
                         @Cached("createBinaryProfile()") ConditionProfile hasFrame,
                         @CachedLibrary(limit = "2") PythonObjectLibrary lib,
@@ -650,23 +640,13 @@ PInt perm(PInt n, PInt k) {
             return factory().createInt(calculatePerm(n.getValue(), k.getValue()));
         }
 
-        @Specialization
-        int perm(@SuppressWarnings("unused") double n, @SuppressWarnings("unused") Object k) {
-            throw raise(TypeError, ErrorMessages.OBJ_CANNOT_BE_INTERPRETED_AS_INTEGER, "float");
-        }
-
-        @Specialization
-        int perm(@SuppressWarnings("unused") Object n, @SuppressWarnings("unused") double k) {
-            throw raise(TypeError, ErrorMessages.OBJ_CANNOT_BE_INTERPRETED_AS_INTEGER, "float");
-        }
-
         @Specialization
         Object perm(VirtualFrame frame, Object n, @SuppressWarnings("unused") PNone k,
                         @Cached FactorialNode factorialNode) {
             return factorialNode.execute(frame, n);
         }
 
-        @Specialization(guards = "!isNumber(n) || !isNumber(k)")
+        @Specialization(guards = "!isPNone(k)")
         Object perm(VirtualFrame frame, Object n, Object k,
                         @Cached("createBinaryProfile()") ConditionProfile hasFrame,
                         @CachedLibrary(limit = "2") PythonObjectLibrary lib,