Update V8 to r5716 as required by WebKit r70949

Change-Id: I0d5cd05bb0427af33e5c9f6efdc209366a32bde3
diff --git a/src/fast-dtoa.cc b/src/fast-dtoa.cc
index ce825f9..c7f6aa1 100644
--- a/src/fast-dtoa.cc
+++ b/src/fast-dtoa.cc
@@ -613,9 +613,10 @@
      kMinimalTargetExponent - (w.e() + DiyFp::kSignificandSize);
   int ten_mk_maximal_binary_exponent =
      kMaximalTargetExponent - (w.e() + DiyFp::kSignificandSize);
-  GetCachedPowerForBinaryExponentRange(ten_mk_minimal_binary_exponent,
-                                       ten_mk_maximal_binary_exponent,
-                                       &ten_mk, &mk);
+  PowersOfTenCache::GetCachedPowerForBinaryExponentRange(
+      ten_mk_minimal_binary_exponent,
+      ten_mk_maximal_binary_exponent,
+      &ten_mk, &mk);
   ASSERT((kMinimalTargetExponent <= w.e() + ten_mk.e() +
           DiyFp::kSignificandSize) &&
          (kMaximalTargetExponent >= w.e() + ten_mk.e() +
@@ -671,9 +672,10 @@
      kMinimalTargetExponent - (w.e() + DiyFp::kSignificandSize);
   int ten_mk_maximal_binary_exponent =
      kMaximalTargetExponent - (w.e() + DiyFp::kSignificandSize);
-  GetCachedPowerForBinaryExponentRange(ten_mk_minimal_binary_exponent,
-                                       ten_mk_maximal_binary_exponent,
-                                       &ten_mk, &mk);
+  PowersOfTenCache::GetCachedPowerForBinaryExponentRange(
+      ten_mk_minimal_binary_exponent,
+      ten_mk_maximal_binary_exponent,
+      &ten_mk, &mk);
   ASSERT((kMinimalTargetExponent <= w.e() + ten_mk.e() +
           DiyFp::kSignificandSize) &&
          (kMaximalTargetExponent >= w.e() + ten_mk.e() +