Migrated several tests from blink to V8 repository.

test/webkit/regexp-backreferences-expected.txt

Index: test/webkit/regexp-backreferences-expected.txt
diff --git a/test/webkit/concat-while-having-a-bad-time-expected.txt b/test/webkit/regexp-backreferences-expected.txt
similarity index 74%
copy from test/webkit/concat-while-having-a-bad-time-expected.txt
copy to test/webkit/regexp-backreferences-expected.txt
index f949db98fd7b911d30b20281c82ee0f801405c77..451ac635f956ba3bab46cb008dc05ae9665b47ae 100644
--- a/test/webkit/concat-while-having-a-bad-time-expected.txt
+++ b/test/webkit/regexp-backreferences-expected.txt
@@ -21,12 +21,23 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-Tests the behavior of Array.prototype.concat while the array is having a bad time due to one of the elements we are concatenating.
+Test to ensure correct behaviour when using backreferences in a RegExp
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
-PASS [42].concat() is [42]
+PASS /(...)\1$/.test('abcabc') is true
+PASS /(...)\1$/.test('abcdef') is false
+PASS /(...)\2$/.test('abcabc') is false
+PASS /(...)\2$/.test('abc') is false
+PASS /\1(...)$/.test('abcabc') is true
+PASS /\1(...)$/.test('abcdef') is true
+PASS /\2(...)$/.test('abcabc') is false
+PASS /\2(...)$/.test('abc') is false
+PASS /\1?(...)$/.test('abc') is true
+PASS /\1?(...)$/.test('abc') is true
+PASS re.test('axabcd') is false
+PASS re.test('axabcsz') is true
 PASS successfullyParsed is true
 
 TEST COMPLETE