target-mips: Add ASE DSP testcases

Add MIPS ASE DSP testcases.

Signed-off-by: Jia Liu <proljc@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

tests/tcg/mips/mips32-dsp/shilov.c

@@ -0,0 +1,29 @@
+#include<stdio.h>
+#include<assert.h>
+
+int main()
+{
+    int rs, ach, acl;
+    int resulth, resultl;
+
+    rs  = 0x0F;
+    ach = 0xBBAACCFF;
+    acl = 0x1C3B001D;
+
+    resulth = 0x17755;
+    resultl = 0x99fe3876;
+
+    __asm
+        ("mthi %0, $ac1\n\t"
+         "mtlo %1, $ac1\n\t"
+         "shilov $ac1, %2\n\t"
+         "mfhi %0, $ac1\n\t"
+         "mflo %1, $ac1\n\t"
+         : "+r"(ach), "+r"(acl)
+         : "r"(rs)
+        );
+    assert(ach == resulth);
+    assert(acl == resultl);
+
+    return 0;
+}