optimization: don't map to get the parameter numbers

java/java-psi-impl/src/com/intellij/psi/impl/TypeCorrector.java

@@ -204,6 +204,11 @@ class TypeCorrector extends PsiTypeMapper {
       });
     }
 
+    @Override
+    public int getParameterCount() {
+      return myDelegate.getParameters().length;
+    }
+
     @NotNull
     @Override
     public ClassResolveResult resolveGenerics() {