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

include/v8config.h

Index: include/v8config.h
diff --git a/include/v8config.h b/include/v8config.h
index ce3a9d2f4f66208810379ef6e9e080ab2ab04459..a7c10e2f10c567da2021421b2ac92d6b05c375f9 100644
--- a/include/v8config.h
+++ b/include/v8config.h
@@ -227,6 +227,9 @@
 # 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))
 
@@ -265,6 +268,9 @@
 # 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))