Fix BigE for Rework scanner-character-streams.

src/parsing/scanner-character-streams.cc

Index: src/parsing/scanner-character-streams.cc
diff --git a/src/parsing/scanner-character-streams.cc b/src/parsing/scanner-character-streams.cc
index f3e7d331c4cb4525569980724bfd54b221146a6c..3d3e59060629ec948eab13e8b146e3e5d766f6fe 100644
--- a/src/parsing/scanner-character-streams.cc
+++ b/src/parsing/scanner-character-streams.cc
@@ -574,8 +574,13 @@ bool TwoByteExternalStreamingStream::ReadBlock() {
   if (lonely_byte) {
     DCHECK_NE(chunk_no, 0);
     Chunk& previous_chunk = chunks_[chunk_no - 1];
+#ifdef V8_TARGET_BIG_ENDIAN
+    uc16 character = current.data[0] |
+                     previous_chunk.data[previous_chunk.byte_length - 1] << 8;
+#else
     uc16 character = previous_chunk.data[previous_chunk.byte_length - 1] |
                      current.data[0] << 8;
+#endif
 
     one_char_buffer_ = character;
     buffer_pos_ = position;