[PATCH} fix --enable-build-with-cxx

[Jack Howarth]

Currently the bootstrap with --enable-build-with-cxx is broken due to compiler 
errors of the form
"error: converting 'false' to pointer type 'varpool_node*' 
[-Werror=conversion-null]". The attached
patch changes these instances of false to NULL and restores the 
--enable-build-with-cxx bootstrap.
Tested on x86_64-apple-darwin10. Okay for gcc trunk?
                Jack

2011-05-05  Jack Howarth <howa...@bromo.med.uc.edu>

        * gcc/tree-inline.c (maybe_inline_call_in_expr): Use NULL.
        * gcc/varpool.c (varpool_extra_name_alias): Likewise.

Index: gcc/tree-inline.c
===================================================================
--- gcc/tree-inline.c   (revision 173423)
+++ gcc/tree-inline.c   (working copy)
@@ -5238,7 +5238,7 @@ maybe_inline_call_in_expr (tree exp)
       id.transform_call_graph_edges = CB_CGE_DUPLICATE;
       id.transform_new_cfg = false;
       id.transform_return_to_modify = true;
-      id.transform_lang_insert_block = false;
+      id.transform_lang_insert_block = NULL;
 
       /* Make sure not to unshare trees behind the front-end's back
         since front-end specific mechanisms may rely on sharing.  */
Index: gcc/varpool.c
===================================================================
--- gcc/varpool.c       (revision 173423)
+++ gcc/varpool.c       (working copy)
@@ -676,7 +676,7 @@ varpool_extra_name_alias (tree alias, tr
 
 #ifndef ASM_OUTPUT_DEF
   /* If aliases aren't supported by the assembler, fail.  */
-  return false;
+  return NULL;
 #endif
 
   gcc_assert (TREE_CODE (decl) == VAR_DECL);