Update V8 to r5017 as required by WebKit r62496

Change-Id: I1b4b7718d1d77ceef07f543e9150a2cb3a628f3a
diff --git a/benchmarks/regexp.js b/benchmarks/regexp.js
index dce15b8..f9f816c 100644
--- a/benchmarks/regexp.js
+++ b/benchmarks/regexp.js
@@ -35,7 +35,7 @@
 // letters in the data are encoded using ROT13 in a way that does not
 // affect how the regexps match their input.
 
-var RegRxp = new BenchmarkSuite('RegExp', 995230, [
+var RegRxp = new BenchmarkSuite('RegExp', 601250, [
   new Benchmark("RegExp", runRegExpBenchmark)
 ]);