[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 42dcdeb5e17198a4c9c46311d1ec77cb55530a03..070e0e6eee33c50906d664752da34d4e9f84d9eb 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,

[Mircea Trofin, 2016/10/15 17:38:39]

Is this related, or can it be a separate CL?

+                                       jsgraph()->SmiConstant(key));
     trap_->AddTrapIfFalse(wasm::kTrapFuncSigMismatch, sig_match, position);
   }