[wasm] Add functionality to decode a function offset table

src/wasm/decoder.h

Index: src/wasm/decoder.h
diff --git a/src/wasm/decoder.h b/src/wasm/decoder.h
index 685f5d0bbf5ec5d7bfa53df55f21bb35a7a457b7..9136fa511d4e3bb562e50612dc944c444d74a3ca 100644
--- a/src/wasm/decoder.h
+++ b/src/wasm/decoder.h
@@ -316,7 +316,7 @@ class Decoder {
     } else {
       result.error_code = kSuccess;
     }
-    result.val = val;
+    result.val = std::move(val);
     return result;
   }