testsuite: Fix up ipa/pr119530.c testcase [PR119318]

I'm seeing
+FAIL: gcc.dg/ipa/pr119530.c execution test
on i686-linux.  The problem is that when long is just 32-bit and
so is unsigned, the testcase then behaves differently and should abort.
Fixed by making the argument long long instead.
While at it, just in case I've changed type of d variable to signed char
as well just in case there is -funsigned-char 8-bit int target or something
similar.

2025-04-14  Jakub Jelinek  <jakub@redhat.com>

	PR ipa/119318
	* gcc.dg/ipa/pr119530.c (d): Change type from char to signed char.
	(e): Change argument type from long to long long.

gcc/testsuite/gcc.dg/ipa/pr119530.c

@@ -5,8 +5,8 @@ struct a {
   int b;
 };
 int c;
-char d;
-static int e(long f) { return f < 0; }
+signed char d;
+static int e(long long f) { return f < 0; }
 static void g(unsigned f) { c = e(~f); }
 int main() {
   int h;