Revert "Handlify concat string and substring."

test/mjsunit/string-slices.js

Index: test/mjsunit/string-slices.js
diff --git a/test/mjsunit/string-slices.js b/test/mjsunit/string-slices.js
index 2fec04b0b084a3a4605f982c8ab391ed22c76a70..5b1dc360ab3c24a0c3569116a01a15ea96e00eba 100755
--- a/test/mjsunit/string-slices.js
+++ b/test/mjsunit/string-slices.js
@@ -222,15 +222,4 @@ function test_crankshaft() {
 
 test_crankshaft();
 %OptimizeFunctionOnNextCall(test_crankshaft);
-test_crankshaft();
-
-var s1 = "12345678901234567890";
-var s2 = "abcdefghijklmnopqrstuvwxyz";
-var c1 = s1 + s2;
-var c2 = s1 + c1 + s2;
-assertEquals("234567890123456789", c1.substring(1, 19));
-assertEquals("bcdefghijklmno", c1.substring(21, 35));
-assertEquals("2345678901234567890abcdefghijklmno", c1.substring(1, 35));
-assertEquals("234567890123456789", c2.substring(1, 19));
-assertEquals("bcdefghijklmno", c2.substring(41, 55));
-assertEquals("2345678901234567890abcdefghijklmno", c2.substring(21, 55));
+test_crankshaft();