[testsuite][arm] Force use of -mfloat-abi=softfp in asm-flag-4.c

The asm-flag-4.c test forces the generation of Thumb code for armv4t,
which is not supported when using the 'hard' FP ABI. This patch
ensures the test uses -mfloat-abi=softfp safely, to avoid irrelevant
failures.

2019-11-28  Christophe Lyon  <christophe.lyon@linaro.org>

	* gcc.target/arm/asm-flag-4.c: Use -mfloat-abi=softfp.

From-SVN: r278804

gcc/testsuite/ChangeLog

+2019-11-28  Christophe Lyon  <christophe.lyon@linaro.org>
+
+	* gcc.target/arm/asm-flag-4.c: Use -mfloat-abi=softfp.
+
 2019-11-28  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/92691

gcc/testsuite/gcc.target/arm/asm-flag-4.c

 /* Test that we do not ice in thumb1 mode */
 /* { dg-do compile } */
-/* { dg-options "-march=armv4t" } */
+/* { dg-require-effective-target arm_arch_v4t_thumb_ok } */
+/* { dg-skip-if "do not override -mfloat-abi" { *-*-* } { "-mfloat-abi=*" } { "-mfloat-abi=softfp" } } */
+/* { dg-options "-march=armv4t -mfloat-abi=softfp" } */
 
 void __attribute__((target("arm"))) f(char *out)
 {