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/wasm/wasm-opcodes.cc b/src/wasm/wasm-opcodes.cc
index 25eef03..a609e03 100644
--- a/src/wasm/wasm-opcodes.cc
+++ b/src/wasm/wasm-opcodes.cc
@@ -25,6 +25,20 @@
 }
 
 
+std::ostream& operator<<(std::ostream& os, const FunctionSig& sig) {
+  if (sig.return_count() == 0) os << "v";
+  for (size_t i = 0; i < sig.return_count(); i++) {
+    os << WasmOpcodes::ShortNameOf(sig.GetReturn(i));
+  }
+  os << "_";
+  if (sig.parameter_count() == 0) os << "v";
+  for (size_t i = 0; i < sig.parameter_count(); i++) {
+    os << WasmOpcodes::ShortNameOf(sig.GetParam(i));
+  }
+  return os;
+}
+
+
 #define DECLARE_SIG_ENUM(name, ...) kSigEnum_##name,