* g++.dg/ipa/devirt-28a.C: Require LTO effective target.
	* g++.dg/ext/sync-4.C (dg-additional-options): Use -march=pentium
	for 32bit x86 targets.
	* gcc.dg/pr36504.c (dg-additional-options): Use -march=i686 -msse
	for 32bit x86 targets.
	* gcc.dg/pr39455.c (dg-additional-options): Ditto.
	* gcc.dg/pr45352-1.c (dg-additional-options): Ditto.
	* gcc.dg/pr63914.c (dg-additional-options): Use -msse
	for 32bit x86 targets.

From-SVN: r222656