[wasm] Fix CFI failures due to Wasm threads.

src/wasm/wasm-interpreter.h

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_WASM_INTERPRETER_H_
 #define V8_WASM_INTERPRETER_H_
 
 #include "src/wasm/wasm-opcodes.h"
 #include "src/zone-containers.h"
 
@@ skipping 145 matching lines @@
   // Gets the current state of the breakpoint at {function}.
   bool GetBreakpoint(const WasmFunction* function, pc_t pc);
 
   // Enable or disable tracing for {function}. Return the previous state.
   bool SetTracing(const WasmFunction* function, bool enabled);
 
   //==========================================================================
   // Thread iteration and inspection.
   //==========================================================================
   int GetThreadCount();
-  Thread& GetThread(int id);
+  Thread* GetThread(int id);
 
   //==========================================================================
   // Stack frame inspection.
   //==========================================================================
   WasmVal GetLocalVal(const WasmFrame* frame, int index);
   WasmVal GetExprVal(const WasmFrame* frame, int pc);
   void SetLocalVal(WasmFrame* frame, int index, WasmVal val);
   void SetExprVal(WasmFrame* frame, int pc, WasmVal val);
 
   //==========================================================================
@@ skipping 23 matching lines @@
  private:
   Zone zone_;
   WasmInterpreterInternals* internals_;
 };
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_INTERPRETER_H_