Fix CI warnings

Author: kg

src/coreclr/interpreter/compiler.h

@@ -873,15 +873,10 @@ int32_t InterpDataItemIndexMap::GetDataItemIndexForT(const T& lookup)
     dn_simdhash_add_result addResult = dn_simdhash_ght_try_insert(
         hash, (void*)pLookup, (void*)(size_t)dataItemIndex, DN_SIMDHASH_INSERT_MODE_ENSURE_UNIQUE
     );
-    switch (addResult) {
-        case DN_SIMDHASH_OUT_OF_MEMORY:
-            NOMEM();
-            break;
-        case DN_SIMDHASH_ADD_OVERWROTE:
-        case DN_SIMDHASH_INTERNAL_ERROR:
-            assert(!"Internal error in dn_simdhash");
-            break;
-    }
+    if (addResult == DN_SIMDHASH_OUT_OF_MEMORY)
+        NOMEM();
+    else if (addResult != DN_SIMDHASH_ADD_INSERTED)
+        assert(!"Internal error in dn_simdhash");
 
     return dataItemIndex;
 }