Fix PCH bug with member templates of local classes in nontemplate functions. 

As noted by Richard in the post:
http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20130624/082605.html, the following code should not add an entry
into PendingLocalImplicitInstantiations, since local instantiations
should only occur within the context of other instantiations:

int foo(double y) {
   struct Lambda {
      template<class T> T operator()(T t) const { return t; };
   } lambda;
   return lambda(y);
}

Hence the attached code does the following:
  1) In MarkFunctionReferenced, check if ActiveInstantiations.size() 
      is non-zero before adding to PendingLocalImplicitInstantiations.
  2) In InstantiateFunctionDefinition, we swap out/in
      PendingLocalImplicitInstantiations so that only those 
      pending local instantiations that are added during the instantiation
      of the current function are instantiated recursively.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184903 91177308-0d34-0410-b5e6-96231b3b80d8