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

test/unittests/wasm/wasm-macro-gen-unittest.cc

 // Copyright 2015 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 "test/unittests/test-utils.h"
 
 #include "src/wasm/wasm-macro-gen.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 31 matching lines @@
   EXPECT_SIZE(5, WASM_F32(10000.0f));
   EXPECT_SIZE(5, WASM_F32(-9828934.0f));
 
   EXPECT_SIZE(9, WASM_F64(1.5));
   EXPECT_SIZE(9, WASM_F64(10200.0));
   EXPECT_SIZE(9, WASM_F64(-9818934.0));
 }
 
 TEST_F(WasmMacroGenTest, Statements) {
   EXPECT_SIZE(1, WASM_NOP);
+  EXPECT_SIZE(1, WASM_END);
 
   EXPECT_SIZE(4, WASM_SET_LOCAL(0, WASM_ZERO));
 
   EXPECT_SIZE(4, WASM_SET_GLOBAL(0, WASM_ZERO));
 
   EXPECT_SIZE(7, WASM_STORE_MEM(MachineType::Int32(), WASM_ZERO, WASM_ZERO));
 
   EXPECT_SIZE(6, WASM_IF(WASM_ZERO, WASM_NOP));
 
   EXPECT_SIZE(8, WASM_IF_ELSE(WASM_ZERO, WASM_NOP, WASM_NOP));
@@ skipping 241 matching lines @@
     EXPECT_SIZE(5, WASM_LOAD_MEM_OFFSET(kMemTypes[i], 11, WASM_ZERO));
   }
   for (size_t i = 0; i < arraysize(kMemTypes); i++) {
     EXPECT_SIZE(7, WASM_STORE_MEM_OFFSET(kMemTypes[i], 13, WASM_ZERO,
                                          WASM_GET_LOCAL(0)));
   }
 }
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8