Fix a WASM compiler test failure (invalid instructions).

WASM compiler test will sometimes generate invalid instructions for
DINS/INS.

BUG=

Review URL: https://codereview.chromium.org/1709633004

Cr-Commit-Position: refs/heads/master@{#34175}

src/mips64/constants-mips64.h

@@ -1206,6 +1206,7 @@ Instruction::Type Instruction::InstructionType(TypeChecks checks) const {
     case SPECIAL3:
       switch (FunctionFieldRaw()) {
         case INS:
+        case DINS:
         case EXT:
         case DEXT:
         case DEXTM: