Remove bogus usage of TREE_ADDRESSABLE in tree.h

[Eric Botcazou <ebotcazou at adacore dot com>]

This reads:

   In a FIELD_DECL node, it means that the programmer is permitted to
   construct the address of this field.  This is used for aliasing
   purposes: see record_component_aliases.

That's bogus, the above description is that of DECL_NONADDRESSABLE_P (or 
rather that of its opposite).  There is no reference to TREE_ADDRESSABLE in 
record_component_aliases.  Moreover mark_addressable is explicit:

void
mark_addressable (tree x)
{
  while (handled_component_p (x))
    x = TREE_OPERAND (x, 0);
  if (TREE_CODE (x) != VAR_DECL
      && TREE_CODE (x) != PARM_DECL
      && TREE_CODE (x) != RESULT_DECL)
    return ;
  TREE_ADDRESSABLE (x) = 1;
}

Applied on the mainline as obvious.


2010-05-14  Eric Botcazou  <ebotcazou@adacore.com>

	* tree.h (TREE_ADDRESSABLE): Remove bogus usage for FIELD_DECL.


-- 
Eric Botcazou

Index: tree.h
===================================================================
--- tree.h	(revision 159211)
+++ tree.h	(working copy)
@@ -411,8 +411,7 @@ struct GTY(()) tree_common {
    addressable_flag:
 
        TREE_ADDRESSABLE in
-           VAR_DECL, PARM_DECL, RESULT_DECL, FUNCTION_DECL, FIELD_DECL
-           LABEL_DECL
+           VAR_DECL, PARM_DECL, RESULT_DECL, FUNCTION_DECL, LABEL_DECL
            all types
            CONSTRUCTOR, IDENTIFIER_NODE
            STMT_EXPR, it means we want the result of the enclosed expression
@@ -1111,9 +1110,6 @@ extern void omp_clause_range_check_faile
    of this is needed.  So it cannot be in a register.
    In a FUNCTION_DECL, nonzero means its address is needed.
    So it must be compiled even if it is an inline function.
-   In a FIELD_DECL node, it means that the programmer is permitted to
-   construct the address of this field.  This is used for aliasing
-   purposes: see record_component_aliases.
    In CONSTRUCTOR nodes, it means object constructed must be in memory.
    In LABEL_DECL nodes, it means a goto for this label has been seen
    from a place outside all binding contours that restore stack levels.