[wasm] Use a Managed<WasmModule> to hold metadata about modules.

src/compiler/wasm-compiler.cc

Index: src/compiler/wasm-compiler.cc
diff --git a/src/compiler/wasm-compiler.cc b/src/compiler/wasm-compiler.cc
index f3c1c5819bf606f97230ba1dc6983d66b31b94ee..652a22e384e1f525f34d9f72d0dde06c75a3412f 100644
--- a/src/compiler/wasm-compiler.cc
+++ b/src/compiler/wasm-compiler.cc
@@ -2157,9 +2157,8 @@ Node* WasmGraphBuilder::CallIndirect(uint32_t index, Node** args, Node*** rets,
         *effect_, *control_);
     int32_t key = module_->module->function_tables[0].map.Find(sig);
     DCHECK_GE(key, 0);
-    Node* sig_match =
-        graph()->NewNode(machine->Word32Equal(),
-                         BuildChangeSmiToInt32(load_sig), Int32Constant(key));
+    Node* sig_match = graph()->NewNode(machine->WordEqual(), load_sig,
+                                       jsgraph()->SmiConstant(key));
     trap_->AddTrapIfFalse(wasm::kTrapFuncSigMismatch, sig_match, position);
   }