testsuite: Add testcase for already fixed PR [PR107385]

This testcase has been fixed by the PR113921 fix, but unlike testcase
in there this one is not target specific.

2024-02-15  Jakub Jelinek  <jakub@redhat.com>

	PR middle-end/107385
	* gcc.dg/pr107385.c: New test.

gcc/testsuite/gcc.dg/pr107385.c

+/* PR middle-end/107385 */
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+__attribute__((noipa)) int
+foo (void)
+{
+  int x;
+  asm goto ("": "=r" (x) : "0" (15) :: lab);
+  x = 6;
+lab:
+  return x;
+}
+
+int
+main ()
+{
+  if (foo () != 6)
+    __builtin_abort ();
+}