Hi,

We have decided to apply the referenced fix (r249352) to the 
ARM/embedded-6-branch along with its initial commit (r249224) to fix an ICE with 
LTO and aliases.

Fix PR69866

     2017-06-20  Thomas Preud'homme  <thomas.preudhomme@arm.com>

         Backport from mainline
         2017-06-15  Jan Hubicka  <hubicka@ucw.cz>
                     Thomas Preud'homme  <thomas.preudhomme@arm.com>

         gcc/
         PR lto/69866
         * lto-symtab.c (lto_symtab_merge_symbols): Drop useless definitions
         that resolved externally.
         2017-06-15  Thomas Preud'homme  <thomas.preudhomme@arm.com>

         gcc/testsuite/
         PR lto/69866
         * gcc.dg/lto/pr69866_0.c: New test.
         * gcc.dg/lto/pr69866_1.c: Likewise.

         Backport from mainline
         2017-06-18  Jan Hubicka  <hubicka@ucw.cz>

         gcc/testsuite/
         * gcc.dg/lto/pr69866_0.c: This test needs alias.

Best regards,

Thomas