re PR rtl-optimization/60651 (Mode switching instructions are sometimes emitted in the wrong order)

gcc/testsuite:
        PR rtl-optimization/60651
        * gcc.target/epiphany/mode-switch.c: New test.

From-SVN: r209318

gcc/testsuite/gcc.target/epiphany/mode-switch.c

+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+/* { dg-final { scan-assembler "#-917506" } } */
+/* PR 60651 */
+
+int a;
+int c;
+
+void __attribute__((interrupt))
+misc_handler (void) {
+   a*= c;
+}