Fix bootstrap failure with clang++ (PR 54484)

[Diego Novillo]

Fix bootstrap failure with clang++.

This patch fixes a bootstrap failure when using clang as the host
compiler.  Default arguments for class template member functions
should be added in the declaration, not the definition.

>From Jason:

> 8.3.6 says "Default arguments for a member function of a class template shall
> be specified on the initial declaration of the member function within the
> class template."

2012-09-04  Diego Novillo  <dnovi...@google.com>

        PR bootstrap/54484
        * vec.h (vec_t::embedded_init): Move default argument value
        to function declaration.

diff --git a/gcc/vec.h b/gcc/vec.h
index c0f1bb2..441c9b5 100644
--- a/gcc/vec.h
+++ b/gcc/vec.h
@@ -171,7 +171,7 @@ struct GTY(()) vec_t
   T &last (ALONE_VEC_CHECK_DECL);
   const T &operator[] (unsigned) const;
   T &operator[] (unsigned);
-  void embedded_init (int, int);
+  void embedded_init (int, int = 0);
 
   template<enum vec_allocation_t A>
   vec_t<T> *copy (ALONE_MEM_STAT_DECL);
@@ -599,7 +599,7 @@ vec_t<T>::iterate (const vec_t<T> *vec, unsigned ix, T 
**ptr)
    final member):
 
    size_t vec_t<T>::embedded_size<T> (int reserve);
-   void v->embedded_init(int reserve, int active = 0);
+   void v->embedded_init(int reserve, int active);
 
    These allow the caller to perform the memory allocation.  */
 
@@ -616,7 +616,7 @@ vec_t<T>::embedded_size (int nelems)
 
 template<typename T>
 void
-vec_t<T>::embedded_init (int nelems, int active = 0)
+vec_t<T>::embedded_init (int nelems, int active)
 {
   prefix_.num_ = active;
   prefix_.alloc_ = nelems;