Fix testcase to not use LTO with -fvtable-verify.

2019-09-05  Caroline Tice  <cmtice@google.com>

        PR testsuite/91670
        * g++.dg/ubsan/pr59415.C: Disable LTO, since test uses
        -fvtable-verify, and the two options are no longer allowed
        together.

From-SVN: r275460

gcc/testsuite/ChangeLog

+2019-09-06  Caroline Tice  <cmtice@google.com>
+
+	PR testsuite/91670
+	* g++.dg/ubsan/pr59415.C: Disable LTO, since test uses
+	-fvtable-verify, and the two options are no longer allowed
+	together.
+
 2019-09-06  Nathan Sidwell  <nathan@acm.org>
 
 	* c-c++-common/cpp/line-1.c: New.

gcc/testsuite/g++.dg/ubsan/pr59415.C

 /* { dg-do compile } */
-/* { dg-options "-fsanitize=null -Wall -fvtable-verify=std" } */
+/* { dg-options "-fsanitize=null -Wall -fvtable-verify=std -fno-lto" } */
 
 void
 foo (void)