The issue is fixed upstream in V8. Thus we do not need this workaround
in REPL.

Fixes: nodejs#548
PR-URL: nodejs#9618
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

V8 5.5 changed how invalid characters are handled and it now appears
to follow the WHATWG Encoding standard, where all of an invalid
character's bytes are replaced by a single replacement character
(\ufffd) instead of replacing each invalid byte with separate
replacement characters.

Example: the byte sequence 0xF0,0xB8,0x41 is decoded as '\ufffdA' in
V8 5.5, but is decoded as '\ufffd\ufffdA' in previous versions of V8.

PR-URL: nodejs#9618
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

V8 5.5 changed how invalid characters are handled and it now appears
to follow the WHATWG Encoding standard, where all of an invalid
character's bytes are replaced by a single replacement character
(\ufffd) instead of replacing each invalid byte with separate
replacement characters.

Example: the byte sequence 0xF0,0xB8,0x41 is decoded as '\ufffdA' in
V8 5.5, but is decoded as '\ufffd\ufffdA' in previous versions of V8.

PR-URL: nodejs#9618
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>