Always set DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT correctly

When profiling is disabled force DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT
for each function to one. This information is then preserved
through LTO.

With this patch for LTO builds -pg needs to be set on both the
LTO final link and the original source build, to allow -pg
(or -pg -fentry) to be active for that source file. This allows
to build large projects mostly with -pg, except for a few files,
and still use LTO.

gcc/:

2014-09-15  Andi Kleen  <ak@linux.intel.com>

	* function.c (allocate_struct_function): Force
	DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT to one when
	profiling is disabled.

From-SVN: r215284

gcc/ChangeLog

+2014-09-15  Andi Kleen  <ak@linux.intel.com>
+
+	* function.c (allocate_struct_function): Force
+	DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT to one when
+	profiling is disabled.
+
 2014-09-15  Trevor Saunders  <tsaunders@mozilla.com>
     
     	* cfgrtl.c, combine.c, config/arc/arc.c, config/mcore/mcore.c,

gcc/function.c

@@ -4555,6 +4555,9 @@ allocate_struct_function (tree fndecl, bool abstract_p)
          but is this worth the hassle?  */
       cfun->can_throw_non_call_exceptions = flag_non_call_exceptions;
       cfun->can_delete_dead_exceptions = flag_delete_dead_exceptions;
+
+      if (!profile_flag && !flag_instrument_function_entry_exit)
+	DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (fndecl) = 1;
     }
 }