[patch] Extend TYPE_DECL_IS_STUB trick in dwarf2out.c

[Eric Botcazou <ebotcazou@adacore.com>]

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As explained in http://gcc.gnu.org/ml/gcc/2011-04/msg00167.html, this patch 
extends the TYPE_DECL_IS_STUB trick in dwarf2out.c to all types.

Tested on x86_64-suse-linux (GCC + GDB), OK for the mainline?


2011-04-09  Eric Botcazou  <ebotcazou@adacore.com>

	* dwarf2out.c (TYPE_DECL_IS_STUB): Extend mechanism to all types.


-- 
Eric Botcazou

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Index: dwarf2out.c
===================================================================
--- dwarf2out.c	(revision 172201)
+++ dwarf2out.c	(working copy)
@@ -6003,19 +6003,19 @@ skeleton_chain_node;
 #endif
 
 /* Define a macro which returns nonzero for a TYPE_DECL which was
-   implicitly generated for a tagged type.
+   implicitly generated for a type.
 
-   Note that unlike the gcc front end (which generates a NULL named
-   TYPE_DECL node for each complete tagged type, each array type, and
-   each function type node created) the g++ front end generates a
-   _named_ TYPE_DECL node for each tagged type node created.
+   Note that, unlike the C front-end (which generates a NULL named
+   TYPE_DECL node for each complete tagged type, each array type,
+   and each function type node created) the C++ front-end generates
+   a _named_ TYPE_DECL node for each tagged type node created.
    These TYPE_DECLs have DECL_ARTIFICIAL set, so we know not to
-   generate a DW_TAG_typedef DIE for them.  */
+   generate a DW_TAG_typedef DIE for them.  Likewise with the Ada
+   front-end, but for each type, tagged or not.  */
 
 #define TYPE_DECL_IS_STUB(decl)				\
   (DECL_NAME (decl) == NULL_TREE			\
    || (DECL_ARTIFICIAL (decl)				\
-       && is_tagged_type (TREE_TYPE (decl))		\
        && ((decl == TYPE_STUB_DECL (TREE_TYPE (decl)))	\
 	   /* This is necessary for stub decls that	\
 	      appear in nested inline functions.  */	\