[wasm] Fix OpcodeLength() calculation.

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"
 
 #define U32_LE(v)                                    \
@@ skipping 92 matching lines @@
 
 #define WASM_NO_LOCALS 0
 
 namespace v8 {
 namespace internal {
 namespace wasm {
 
 inline void CheckI32v(int32_t value, int length) {
   DCHECK(length >= 1 && length <= 5);
   DCHECK(length == 5 || I32V_IN_RANGE(value, length));
-  DCHECK(length == 1 || !I32V_IN_RANGE(value, length - 1));

[binji, 2016/03/11 18:10:03]

yeah, probably better this way.

 }
 
 inline void CheckI64v(int64_t value, int length) {
   DCHECK(length >= 1 && length <= 10);
   DCHECK(length == 10 || I64V_IN_RANGE(value, length));
-  DCHECK(length == 1 || !I64V_IN_RANGE(value, length - 1));
 }
 
 // A helper for encoding local declarations prepended to the body of a
 // function.
 class LocalDeclEncoder {
  public:
   // Prepend local declarations by creating a new buffer and copying data
   // over. The new buffer must be delete[]'d by the caller.
   void Prepend(const byte** start, const byte** end) const {
     size_t size = (*end - *start);
@@ skipping 375 matching lines @@
 #define WASM_F64_SCONVERT_I32(x) kExprF64SConvertI32, x
 #define WASM_F64_UCONVERT_I32(x) kExprF64UConvertI32, x
 #define WASM_F64_SCONVERT_I64(x) kExprF64SConvertI64, x
 #define WASM_F64_UCONVERT_I64(x) kExprF64UConvertI64, x
 #define WASM_F64_CONVERT_F32(x) kExprF64ConvertF32, x
 #define WASM_F64_REINTERPRET_I64(x) kExprF64ReinterpretI64, x
 #define WASM_I32_REINTERPRET_F32(x) kExprI32ReinterpretF32, x
 #define WASM_I64_REINTERPRET_F64(x) kExprI64ReinterpretF64, x
 
 #endif  // V8_WASM_MACRO_GEN_H_