Convert vec<> into a POD.

This fixes PR 55398 by making vec<> a true POD.  I thought we could get
away with having private fields, but we can't.  We fail to pass vec<>
instances through varargs.

The patch makes every field public and mangles the field names in the
hope that no future patch will try to make use of them directly.  It's
horrible, but I could not think of anything better.

Tested with clang++ as the host compiler.

2012-11-20  Diego Novillo  <dnovillo@google.com>

    PR middle-end/55398
    * vec.h (class vec_prefix): Make every field public.
    Rename field alloc_ to alloc_PRIVATE_.
    Rename field num_ to num_PRIVATE_.
    Update all users.
    (class vec<T, A, vl_embed>): Make every field public.
    Rename field pfx_ to pfx_PRIVATE_.
    Rename field data_ to data_PRIVATE_.
    Update all users.
    (class vec<T, A, vl_ptr>): Make every field public.
    Rename field vec_ to vec_PRIVATE_.
    Update all users.

From-SVN: r193667

gcc/ChangeLog

+2012-11-20  Diego Novillo  <dnovillo@google.com>
+
+	PR middle-end/55398
+	* vec.h (class vec_prefix): Make every field public.
+	Rename field alloc_ to alloc_PRIVATE_.
+	Rename field num_ to num_PRIVATE_.
+	Update all users.
+	(class vec<T, A, vl_embed>): Make every field public.
+	Rename field pfx_ to pfx_PRIVATE_.
+	Rename field data_ to data_PRIVATE_.
+	Update all users.
+	(class vec<T, A, vl_ptr>): Make every field public.
+	Rename field vec_ to vec_PRIVATE_.
+	Update all users.
+
 2012-11-20  Kai Tietz  <ktietz@redhat.com>
 
 	PR target/55268

gcc/vec.c

@@ -121,7 +121,7 @@ vec_descriptor (const char *name, int line, const char *function)
 /* Account the overhead.  */
 
 void
-vec_prefix::register_overhead (size_t size, const char *name, int line,
+vec_prefix::register_overhead_PRIVATE_ (size_t size, const char *name, int line,
 			                const char *function)
 {
   struct vec_descriptor *loc = vec_descriptor (name, line, function);
@@ -148,7 +148,7 @@ vec_prefix::register_overhead (size_t size, const char *name, int line,
 /* Notice that the memory allocated for the vector has been freed.  */
 
 void
-vec_prefix::release_overhead (void)
+vec_prefix::release_overhead_PRIVATE_ (void)
 {
   PTR *slot = htab_find_slot_with_hash (ptr_hash, this,
 					htab_hash_pointer (this),
@@ -165,15 +165,16 @@ vec_prefix::release_overhead (void)
    exponentially.  PFX is the control data for the vector.  */
 
 unsigned
-vec_prefix::calculate_allocation (vec_prefix *pfx, unsigned reserve, bool exact)
+vec_prefix::calculate_allocation_PRIVATE_ (vec_prefix *pfx, unsigned reserve,
+					   bool exact)
 {
   unsigned alloc = 0;
   unsigned num = 0;
 
   if (pfx)
     {
-      alloc = pfx->alloc_;
-      num = pfx->num_;
+      alloc = pfx->alloc_PRIVATE_;
+      num = pfx->num_PRIVATE_;
     }
   else if (!reserve)
     /* If there's no vector, and we've not requested anything, then we