testsuite: Fix pr101145inf*.c testcases [PR117494]

Instead of doing a dg-run with a specific target check for linux.
Use signal as the effective-target since this requires the use
of ALARM signal to do the testing.
Also use check_vect in the main and renames main to main1 to make sure
we don't use the registers.

Tested on x86_64-linux-gnu.

	PR testsuite/117494
gcc/testsuite/ChangeLog:

	* gcc.dg/vect/pr101145inf.c: Remove dg-do and replace
	with dg-require-effective-target of signal.
	* gcc.dg/vect/pr101145inf_1.c: Likewise.
	* gcc.dg/vect/pr101145inf.inc: Rename main to main1
	and mark as noinline.
	Include tree-vect.h. Have main call check_vect and main1.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>

gcc/testsuite/gcc.dg/vect/pr101145inf.c

-/* { dg-do run { target *-*-linux* *-*-gnu* *-*-uclinux* } } */
+/* { dg-require-effective-target signal } */
 /* { dg-additional-options "-O3" } */
 #include <limits.h>
 #include "pr101145inf.inc"

gcc/testsuite/gcc.dg/vect/pr101145inf.inc

 #include <unistd.h>
 #include <signal.h>
 #include <stdlib.h>
+#include "tree-vect.h"
 
 void test_finite ();
 void test_infinite ();
@@ -10,7 +11,8 @@ void do_exit (int i)
   exit (0);
 }
 
-int main(void)
+__attribute__((noinline))
+int main1(void)
 {
   test_finite ();
   struct sigaction s;
@@ -26,3 +28,8 @@ int main(void)
   return 1;
 }
 
+int main(void)
+{
+  check_vect ();
+  return main1();
+}

gcc/testsuite/gcc.dg/vect/pr101145inf_1.c

-/* { dg-do run { target *-*-linux* *-*-gnu* *-*-uclinux* } } */
+/* { dg-require-effective-target signal } */
 /* { dg-additional-options "-O3" } */
 #include <limits.h>
 #include "pr101145inf.inc"