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

src/wasm/wasm-macro-gen.h

 // 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.
 
 #ifndef V8_WASM_MACRO_GEN_H_
 #define V8_WASM_MACRO_GEN_H_
 
 #include "src/wasm/wasm-opcodes.h"
 
 #include "src/zone/zone-containers.h"
@@ skipping 41 matching lines @@
       static_cast<byte>((((x) >> 14) & MASK_7) | 0x80), \
       static_cast<byte>((((x) >> 21) & MASK_7) | 0x80), \
       static_cast<byte>((((x) >> 28) & MASK_7))
 
 // Convenience macros for building Wasm bytecode directly into a byte array.
 
 //------------------------------------------------------------------------------
 // Control.
 //------------------------------------------------------------------------------
 #define WASM_NOP kExprNop
+#define WASM_END kExprEnd
 
 #define ARITY_0 0
 #define ARITY_1 1
 #define ARITY_2 2
 #define DEPTH_0 0
 #define DEPTH_1 1
 #define DEPTH_2 2
 #define ARITY_2 2
 
 #define WASM_BLOCK(...) kExprBlock, kLocalVoid, __VA_ARGS__, kExprEnd
@@ skipping 599 matching lines @@
 #define WASM_BRV(depth, val) val, kExprBr, static_cast<byte>(depth)
 #define WASM_BRV_IF(depth, val, cond) \
   val, cond, kExprBrIf, static_cast<byte>(depth)
 #define WASM_BRV_IFD(depth, val, cond) \
   val, cond, kExprBrIf, static_cast<byte>(depth), kExprDrop
 #define WASM_IFB(cond, ...) cond, kExprIf, kLocalVoid, __VA_ARGS__, kExprEnd
 #define WASM_BR_TABLEV(val, key, count, ...) \
   val, key, kExprBrTable, U32V_1(count), __VA_ARGS__
 
 #endif  // V8_WASM_MACRO_GEN_H_