testsuite: Fix up pr116488.c and pr117226.c tests [PR116488]

Hi!

On Mon, Oct 21, 2024 at 01:39:52PM -0600, Jeff Law wrote:
> 	* gcc.dg/torture/pr116488.c: New test.
> 	* gcc.dg/torture/pr117226.c: New test.

These two tests FAIL on powerpc64le-linux (and I assume on all other
-funsigned-char defaulting targets).

The following patch fixes that, tested on powerpc64le-linux and
x86_64-linux (-m32/-m64); on x86_64 also tested before/after with
-funsigned-char.

Ok for trunk?

2024-10-22  Jakub Jelinek  <jakub@redhat.com>

	PR rtl-optimization/116488
	PR rtl-optimization/117226
	* gcc.dg/torture/pr116488.c (c, e): Change type from char to
	signed char.
	* gcc.dg/torture/pr117226.c (main): Change f type from char to
	signed char.

gcc/testsuite/gcc.dg/torture/pr116488.c

@@ -1,7 +1,7 @@
 /* { dg-do run } */
 /* { dg-additional-options "-fno-forward-propagate" } */
 int a, b;
-char c, e;
+signed char c, e;
 unsigned char d;
 __attribute__ ((noinline,noclone,noipa))
 void f(int g, short h) {

gcc/testsuite/gcc.dg/torture/pr117226.c

@@ -5,7 +5,7 @@
 int a = 128, b, d;
 long e = -2, c;
 int main() {
-  char f = a;
+  signed char f = a;
   int g = f;
   c = (g < 0) - e;
   unsigned char h = g;