Upgrade V8 to 5.1.281.57  DO NOT MERGE

FPIIM-449

Change-Id: Id981b686b4d587ac31697662eb98bb34be42ad90
(cherry picked from commit 3b9bc31999c9787eb726ecdbfd5796bfdec32a18)
diff --git a/test/fuzzer/testcfg.py b/test/fuzzer/testcfg.py
index 976325a..35a5abb 100644
--- a/test/fuzzer/testcfg.py
+++ b/test/fuzzer/testcfg.py
@@ -18,7 +18,7 @@
 
 
 class FuzzerTestSuite(testsuite.TestSuite):
-  SUB_TESTS = ( 'json', 'parser', 'regexp', )
+  SUB_TESTS = ( 'json', 'parser', 'regexp', 'wasm', 'wasm_asmjs', )
 
   def __init__(self, name, root):
     super(FuzzerTestSuite, self).__init__(name, root)