Include all x86 targets in branch_cost effective target

	* lib/target-supports.exp (check_effective_target_branch_cost):
	Accept all x86 targets.

From-SVN: r256567

gcc/testsuite/ChangeLog

+2018-01-12  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	* lib/target-supports.exp (check_effective_target_branch_cost):
+	Accept all x86 targets.
+
 2018-01-12  Martin Liska  <mliska@suse.cz>
 
 	PR ipa/83054

gcc/testsuite/lib/target-supports.exp

@@ -8647,7 +8647,7 @@ proc check_effective_target_branch_cost {} {
 	 || [istarget avr*-*-*]
 	 || [istarget epiphany*-*-*]
 	 || [istarget frv*-*-*]
-	 || [istarget i?86-*-linux*] || [istarget x86_64-*-linux*]
+	 || [istarget i?86-*-*] || [istarget x86_64-*-*]
 	 || [istarget mips*-*-*]
 	 || [istarget s390*-*-*]
 	 || [istarget riscv*-*-*]