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/mips64-dsp/shrlv_qh.c

@@ -0,0 +1,23 @@
+#include "io.h"
+
+int main(void)
+{
+    long long rd, rt, rs;
+    long long res;
+
+    rt = 0x8765679abc543786;
+    rs = 0x4;
+    res = 0x087606790bc50378;
+
+    __asm
+        ("shrlv.qh %0, %1, %2\n\t"
+         : "=r"(rd)
+         : "r"(rt), "r"(rs)
+        );
+
+    if (rd != res) {
+        printf("shrlv.qh error\n");
+        return -1;
+    }
+    return 0;
+}