ipa-fnsummary.c: fix use-after-free crash (PR jit/82826)

gcc/ChangeLog:
	PR jit/82826
	* ipa-fnsummary.c (ipa_fnsummary_c_finalize): New function.
	* ipa-fnsummary.h (ipa_fnsummary_c_finalize): New decl.
	* toplev.c: Include "ipa-fnsummary.h".
	(toplev::finalize): Call ipa_fnsummary_c_finalize.

From-SVN: r254458

gcc/ChangeLog

+2017-11-06  David Malcolm  <dmalcolm@redhat.com>
+
+	PR jit/82826
+	* ipa-fnsummary.c (ipa_fnsummary_c_finalize): New function.
+	* ipa-fnsummary.h (ipa_fnsummary_c_finalize): New decl.
+	* toplev.c: Include "ipa-fnsummary.h".
+	(toplev::finalize): Call ipa_fnsummary_c_finalize.
+
 2017-11-06  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/82838

gcc/ipa-fnsummary.c

@@ -3619,3 +3619,12 @@ make_pass_ipa_fn_summary (gcc::context *ctxt)
 {
   return new pass_ipa_fn_summary (ctxt);
 }
+
+/* Reset all state within ipa-fnsummary.c so that we can rerun the compiler
+   within the same process.  For use by toplev::finalize.  */
+
+void
+ipa_fnsummary_c_finalize (void)
+{
+  ipa_free_fn_summary ();
+}

gcc/ipa-fnsummary.h

@@ -266,4 +266,6 @@ void estimate_node_size_and_time (struct cgraph_node *node,
 				  vec<inline_param_summary>
 				  inline_param_summary);
 
+void ipa_fnsummary_c_finalize (void);
+
 #endif /* GCC_IPA_FNSUMMARY_H */

gcc/toplev.c

@@ -83,6 +83,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "edit-context.h"
 #include "tree-pass.h"
 #include "dumpfile.h"
+#include "ipa-fnsummary.h"
 
 #if defined(DBX_DEBUGGING_INFO) || defined(XCOFF_DEBUGGING_INFO)
 #include "dbxout.h"
@@ -2236,6 +2237,7 @@ toplev::finalize (void)
 
   /* Needs to be called before cgraph_c_finalize since it uses symtab.  */
   ipa_reference_c_finalize ();
+  ipa_fnsummary_c_finalize ();
 
   cgraph_c_finalize ();
   cgraphunit_c_finalize ();