[arm] Fix gcc.target/arm/pr70278.c

This test needs an armv4t Thumb1 target but doesn't add the right effective target checks.
This patch adds them so the test is skipped appropriately on Thumb2 hard-float tarets.

     * gcc.target/arm/pr70278.c: Add effective target checks for armv4t
     and arm_thumb1_ok.

From-SVN: r256848

gcc/testsuite/ChangeLog

+2018-01-18  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
+
+	* gcc.target/arm/pr70278.c: Add effective target checks for armv4t
+	and arm_thumb1_ok.
+
 2018-01-18  Boris Kolpackov  <boris@codesynthesis.com>
 
         PR other/70268

gcc/testsuite/gcc.target/arm/pr70278.c

 /* { dg-do compile } */
 /* { dg-skip-if "avoid conflicting multilib options" { *-*-* } { "-march=*" } { "-march=armv4t" } } */
 /* { dg-skip-if "avoid conflicting multilib options" { *-*-* } { "-marm" } { "" } } */
+/* { dg-require-effective-target arm_arch_v4t_ok } */
+/* { dg-require-effective-target arm_thumb1_ok } */
 /* { dg-options "-mthumb" } */
 /* { dg-add-options arm_arch_v4t } */
 /*