re PR target/82442 (vect/pr31699.c fails on arm)

Fix PR82442

Recently the gcc.dg/vect/pr31699.c was modified to check for
vect_float effective target instead for vect_double.  As a 
result it now fails on armhf.  Fix by avoiding double.
Tested on armhf, aarch64 and x64.

    gcc/testsuite/
	PR target/82442
	* gcc.dg/vect/pr31699.c: Fix testcase.

From-SVN: r253786

gcc/testsuite/ChangeLog

+2017-10-16  Wilco Dijkstra  <wdijkstr@arm.com>
+
+	PR target/82442
+	* gcc.dg/vect/pr31699.c: Fix testcase.
+
 2017-10-16  Tamar Christina  <tamar.christina@arm.com>
 
 	* gcc.target/aarch64/advsimd-intrinsics/vect-dot-qi.h: New.

gcc/testsuite/gcc.dg/vect/pr31699.c

@@ -7,9 +7,9 @@
 float x[256];
 
 __attribute__ ((noinline))
-double *foo(void)
+float *foo(void)
 {
- double *z = malloc (sizeof(double) * 256);
+ float *z = malloc (sizeof(float) * 256);
 
  int i;
  for (i=0; i<256; ++i)