[wasm] Enforce that function bodies end with the \"end\" opcode.

test/cctest/wasm/test-run-wasm-interpreter.cc

 // 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.
 
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include <memory>
 
@@ skipping 201 matching lines @@
 
       // Check the thread finished with the right value.
       CHECK_EQ(WasmInterpreter::FINISHED, thread->state());
       uint32_t expected = (*a) + (b);
       CHECK_EQ(expected, thread->GetReturnValue().to<uint32_t>());
     }
   }
 }
 
 TEST(Step_I32Mul) {
-  static const int kTraceLength = 4;
+  static const int kTraceLength = 5;
   byte code[] = {WASM_I32_MUL(WASM_GET_LOCAL(0), WASM_GET_LOCAL(1))};
 
   WasmRunner<int32_t, uint32_t, uint32_t> r(kExecuteInterpreted);
 
   r.Build(code, code + arraysize(code));
 
   WasmInterpreter* interpreter = r.interpreter();
   WasmInterpreter::Thread* thread = interpreter->GetThread(0);
 
   FOR_UINT32_INPUTS(a) {
@@ skipping 160 matching lines @@
     BUILD(r, WASM_F64_MUL(WASM_GET_LOCAL(0), WASM_GET_LOCAL(1)));
     r.Call(1048575.5, 2.5);
     CHECK(!r.possible_nondeterminism());
     r.Call(std::numeric_limits<double>::infinity(), 0.0);
     CHECK(r.possible_nondeterminism());
   }
 }
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8