<apex:page controller="VF_Lion_Pitch_Me2NEW" sidebar="false" tabStyle="Pitch_Me__tab">
<apex:form>

<script type="text/javascript">
    function count()
    {
    alert('{!RoleTypeCount}');
    }
 </script

<apex:pageBlock>
<div id="" style="" ><b>Role Type:&nbsp;</b> <br/>

<apex:selectRadio layout="pagedirection" value="{!SearchRoleType}" onchange="PutValue(this);" style="" >
       <apex:selectoptions value="{!roletypesvalue}" />
       <apex:actionSupport event="onchange" oncomplete="count()" reRender="" />
  </apex:selectRadio>
  </div>
 </apex:pageBlock>
</apex:form>
</apex:page

public with sharing class VF_Lion_Pitch_Me2NEW{
public Integer RoleTypeCount{get;set;}

List <Job__c> job =new list <Job__c>();
 public List<selectoption> getRoletypesvalue() {
   list<selectoption> options = new list<selectoption>();

    Schema.DescribeFieldResult fieldResult = job__c.Role_Type__c.getDescribe();

    list<schema.picklistentry> values = fieldResult.getPickListValues();

    for (Schema.PicklistEntry a : values)
    {
     List <Job__c> job= [select Role_Type__c from job__c  where Role_Type__c=:a.getValue()] ;


     if(job.size()>0)
     options.add(new SelectOption(a.getLabel(), a.getValue()));
    }
  system.debug('7777'+options.size());
  RoleTypeCount=options.size();

    return options;
}