Roll V8 back to 3.6

Roll back to V8 3.6 to fix x86 build, we don't have ucontext.h.

This reverts commits:
5d4cdbf7a67d3662fa0bee4efdb7edd8daec9b0b
c7cc028aaeedbbfa11c11d0b7b243b3d9e837ed9
592a9fc1d8ea420377a2e7efd0600e20b058be2b

Bug: 5688872
Change-Id: Ic961bb5e65b778e98bbfb71cce71d99fa949e995
diff --git a/test/mjsunit/string-externalize.js b/test/mjsunit/string-externalize.js
index d52a7e2..da89786 100644
--- a/test/mjsunit/string-externalize.js
+++ b/test/mjsunit/string-externalize.js
@@ -44,7 +44,7 @@
   assertFalse(isAsciiString(twoByteExternalWithAsciiData));
 
   var realTwoByteExternalString =
-      "\u1234\u1234\u1234\u1234" + (function() { return "\u1234"; })();
+      "\u1234\u1234" + (function() { return "\u1234"; })();
   externalizeString(realTwoByteExternalString);
   assertFalse(isAsciiString(realTwoByteExternalString));