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/insv.c

@@ -0,0 +1,26 @@
+#include "io.h"
+
+int main(void)
+{
+    long long rt, rs, dsp;
+    long long result;
+
+    /* msb = 10, lsb = 5 */
+    dsp    = 0x305;
+    rt     = 0x12345678;
+    rs     = 0xffffffff87654321;
+    result = 0x12345338;
+    __asm
+        ("wrdsp %2, 0x03\n\t"
+         "insv  %0, %1\n\t"
+         : "+r"(rt)
+         : "r"(rs), "r"(dsp)
+        );
+    if (rt != result) {
+        printf("insv wrong\n");
+
+        return -1;
+    }
+
+    return 0;
+}