Do not drop PURE/CONST flags when reading profile feedback

Do not drop PURE/CONST flags when reading profile feedback

[Jan Hubicka]

Hi,
tree_profiling clears PURE/CONST flags on all functions it touches.  This is
from the times when optimization and instrumentation was mixed and it was
necessary to keep things synchronized so early optimization of later functions
is not affected by the instrumentation.  This is no longer case for several
years.

I also added a dump to tree profile pass since it is only time one can
see the CFG with profile in it prior going to LTO.

Profiledbootstrapped/regtested ppc64le-linux.

Honza
	* tree-profile.c (tree_profiling): Do not clear
	pure/const when not instrumenting.
	(pass tree_profile): Add dump of symtab.
Index: tree-profile.c
===================================================================
--- tree-profile.c	(revision 228684)
+++ tree-profile.c	(working copy)
@@ -564,20 +564,21 @@
     }
 
   /* Drop pure/const flags from instrumented functions.  */
-  FOR_EACH_DEFINED_FUNCTION (node)
-    {
-      if (!gimple_has_body_p (node->decl)
-	  || !(!node->clone_of
-	  || node->decl != node->clone_of->decl))
-	continue;
+  if (profile_arc_flag || flag_test_coverage)
+    FOR_EACH_DEFINED_FUNCTION (node)
+      {
+	if (!gimple_has_body_p (node->decl)
+	    || !(!node->clone_of
+	    || node->decl != node->clone_of->decl))
+	  continue;
 
-      /* Don't profile functions produced for builtin stuff.  */
-      if (DECL_SOURCE_LOCATION (node->decl) == BUILTINS_LOCATION)
-	continue;
+	/* Don't profile functions produced for builtin stuff.  */
+	if (DECL_SOURCE_LOCATION (node->decl) == BUILTINS_LOCATION)
+	  continue;
 
-      node->set_const_flag (false, false);
-      node->set_pure_flag (false, false);
-    }
+	node->set_const_flag (false, false);
+	node->set_pure_flag (false, false);
+      }
 
   /* Update call statements and rebuild the cgraph.  */
   FOR_EACH_DEFINED_FUNCTION (node)
@@ -633,7 +634,7 @@
   0, /* properties_provided */
   0, /* properties_destroyed */
   0, /* todo_flags_start */
-  0, /* todo_flags_finish */
+  TODO_dump_symtab, /* todo_flags_finish */
 };
 
 class pass_ipa_tree_profile : public simple_ipa_opt_pass