Revert "Revert "Upgrade to 5.0.71.48"" DO NOT MERGE

This reverts commit f2e3994fa5148cc3d9946666f0b0596290192b0e,
and updates the x64 makefile properly so it doesn't break that
build.

FPIIM-449

Change-Id: Ib83e35bfbae6af627451c926a9650ec57c045605
(cherry picked from commit 109988c7ccb6f3fd1a58574fa3dfb88beaef6632)
diff --git a/src/ostreams.h b/src/ostreams.h
index 56f4aa7..1c2f38a 100644
--- a/src/ostreams.h
+++ b/src/ostreams.h
@@ -50,6 +50,12 @@
 };
 
 
+struct AsUC32 {
+  explicit AsUC32(int32_t v) : value(v) {}
+  int32_t value;
+};
+
+
 struct AsReversiblyEscapedUC16 {
   explicit AsReversiblyEscapedUC16(uint16_t v) : value(v) {}
   uint16_t value;
@@ -73,6 +79,10 @@
 // of printable ASCII range.
 std::ostream& operator<<(std::ostream& os, const AsUC16& c);
 
+// Writes the given character to the output escaping everything outside
+// of printable ASCII range.
+std::ostream& operator<<(std::ostream& os, const AsUC32& c);
+
 }  // namespace internal
 }  // namespace v8