target-alpha: Fix ret instruction

Hopefully pine doesn't corrupt this patch, I've had problems recently.

For an alpha "ret" instruction, of the type
     ret $26

The return was being ignored.  This is because in translate.c
register $26 (the return address) was being over-written with the current
PC before it could be jumped to.  Thus the ret was ignored.

This patch just re-orders things so the return address is processed before
it is over-written with the current PC.

(Vince Weaver)

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5638 c046a42c-6fe2-441c-8c8c-71466251a162

target-alpha/translate.c

@@ -1634,12 +1634,12 @@ static always_inline int translate_one (DisasContext *ctx, uint32_t insn)
         break;
 #endif
     case 0x1A:
-        if (ra != 31)
-            tcg_gen_movi_i64(cpu_ir[ra], ctx->pc);
         if (rb != 31)
             tcg_gen_andi_i64(cpu_pc, cpu_ir[rb], ~3);
         else
             tcg_gen_movi_i64(cpu_pc, 0);
+        if (ra != 31)
+            tcg_gen_movi_i64(cpu_ir[ra], ctx->pc);
         /* Those four jumps only differ by the branch prediction hint */
         switch (fn2) {
         case 0x0: