re PR target/65531 (ICE: symtab_node::verify failed: Two symbols with same comdat_group are not linked by the same_comdat_group list. with -fcheck-pointer-bounds -mmpx)

gcc/

	PR target/65531
	* ipa-chkp.c (chkp_maybe_create_clone): Don't set
	same_comdat_group for external symbols.
	* symtab.c (symtab_node::verify_symtab_nodes): Avoid
	infinite same_comdat_group traversal loop.

gcc/testsuite/

	PR target/65531
	* gcc.target/i386/mpx/pr65531.cc: New.

From-SVN: r221788