Add external strings support to regexp in generated code.

test/mjsunit/string-externalize.js

Index: test/mjsunit/string-externalize.js
diff --git a/test/mjsunit/string-externalize.js b/test/mjsunit/string-externalize.js
index 9edb615ef7a649bb632f7efbb1ff075d1d9072d4..e682195c1f55f999f7743f626c85bc433c3aa64e 100644
--- a/test/mjsunit/string-externalize.js
+++ b/test/mjsunit/string-externalize.js
@@ -87,30 +87,6 @@ function test() {
 
   // Flattened string should still be two-byte.
   assertFalse(isAsciiString(str2));
-
-  // Test buffered external strings.
-  var charat_str = new Array(5);
-  charat_str[0] = "0123456789ABCDEF0123456789ABCDEF\
-0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF\
-0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF\
-0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF\
-0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF";
-  charat_str[1] = "0123456789ABCDEF";
-  for (var i = 0; i < 6; i++) charat_str[1] += charat_str[1];
-  try {  // String can only be externalized once
-    externalizeString(charat_str[0], false);
-    externalizeString(charat_str[1], true);
-  } catch (ex) { }
-  charat_str[2] = charat_str[0].slice(0, -1);
-  charat_str[3] = charat_str[1].slice(0, -1);
-  charat_str[4] = charat_str[0] + charat_str[0];
-
-  for (var i = 0; i < 5; i++) {
-    assertEquals('B', charat_str[i].charAt(6*16 + 11));
-    assertEquals('C', charat_str[i].charAt(6*16 + 12));
-    assertEquals('A', charat_str[i].charAt(3*16 + 10));
-    assertEquals('B', charat_str[i].charAt(3*16 + 11));
-  }
 }
 
 // Run the test many times to ensure IC-s don't break things.