Fix wrong endianness of wasm header in WasmModuleWriter on big-endian platforms

include/v8config.h

 // Copyright 2013 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 V8CONFIG_H_
 #define V8CONFIG_H_
 
 // clang-format off
 
 // Platform headers for feature detection below.
@@ skipping 209 matching lines @@
     (__has_attribute(warn_unused_result))
 
 # define V8_HAS_BUILTIN_CLZ (__has_builtin(__builtin_clz))
 # define V8_HAS_BUILTIN_CTZ (__has_builtin(__builtin_ctz))
 # define V8_HAS_BUILTIN_EXPECT (__has_builtin(__builtin_expect))
 # define V8_HAS_BUILTIN_FRAME_ADDRESS (__has_builtin(__builtin_frame_address))
 # define V8_HAS_BUILTIN_POPCOUNT (__has_builtin(__builtin_popcount))
 # define V8_HAS_BUILTIN_SADD_OVERFLOW (__has_builtin(__builtin_sadd_overflow))
 # define V8_HAS_BUILTIN_SSUB_OVERFLOW (__has_builtin(__builtin_ssub_overflow))
 # define V8_HAS_BUILTIN_UADD_OVERFLOW (__has_builtin(__builtin_uadd_overflow))
+# define V8_HAS_BUILTIN_BSWAP16 (__has_builtin(__builtin_bswap16))
+# define V8_HAS_BUILTIN_BSWAP32 (__has_builtin(__builtin_bswap32))
+# define V8_HAS_BUILTIN_BSWAP64 (__has_builtin(__builtin_bswap64))
 
 # define V8_HAS_CXX11_ALIGNAS (__has_feature(cxx_alignas))
 
 #elif defined(__GNUC__)
 
 # define V8_CC_GNU 1
 # if defined(__INTEL_COMPILER)  // Intel C++ also masquerades as GCC 3.2.0
 #  define V8_CC_INTEL 1
 # endif
 # if defined(__MINGW32__)
@@ skipping 18 matching lines @@
 # define V8_HAS_ATTRIBUTE_UNUSED (V8_GNUC_PREREQ(2, 95, 0))
 # define V8_HAS_ATTRIBUTE_VISIBILITY (V8_GNUC_PREREQ(4, 3, 0))
 # define V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT \
     (!V8_CC_INTEL && V8_GNUC_PREREQ(4, 1, 0))
 
 # define V8_HAS_BUILTIN_CLZ (V8_GNUC_PREREQ(3, 4, 0))
 # define V8_HAS_BUILTIN_CTZ (V8_GNUC_PREREQ(3, 4, 0))
 # define V8_HAS_BUILTIN_EXPECT (V8_GNUC_PREREQ(2, 96, 0))
 # define V8_HAS_BUILTIN_FRAME_ADDRESS (V8_GNUC_PREREQ(2, 96, 0))
 # define V8_HAS_BUILTIN_POPCOUNT (V8_GNUC_PREREQ(3, 4, 0))
+# define V8_HAS_BUILTIN_BSWAP16 (V8_GNUC_PREREQ(4, 8, 0))
+# define V8_HAS_BUILTIN_BSWAP32 (V8_GNUC_PREREQ(4, 8, 0))
+# define V8_HAS_BUILTIN_BSWAP64 (V8_GNUC_PREREQ(4, 8, 0))
 
 # if __cplusplus >= 201103L
 #  define V8_HAS_CXX11_ALIGNAS (V8_GNUC_PREREQ(4, 8, 0))
 #  define V8_HAS_CXX11_ALIGNOF (V8_GNUC_PREREQ(4, 8, 0))
 # endif
 #endif
 
 #if defined(_MSC_VER)
 # define V8_CC_MSVC 1
 # define V8_HAS___ALIGNOF 1
@@ skipping 145 matching lines @@
 //   int foo() WARN_UNUSED_RESULT;
 #if V8_HAS_ATTRIBUTE_WARN_UNUSED_RESULT
 #define V8_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
 #else
 #define V8_WARN_UNUSED_RESULT /* NOT SUPPORTED */
 #endif
 
 // clang-format on
 
 #endif  // V8CONFIG_H_