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/compiler/js-builtin-reducer.h b/src/compiler/js-builtin-reducer.h
index cfacdc1..b64b335 100644
--- a/src/compiler/js-builtin-reducer.h
+++ b/src/compiler/js-builtin-reducer.h
@@ -9,6 +9,10 @@
 
 namespace v8 {
 namespace internal {
+
+// Forward declarations.
+class TypeCache;
+
 namespace compiler {
 
 // Forward declarations.
@@ -30,6 +34,7 @@
   Reduction ReduceMathMax(Node* node);
   Reduction ReduceMathImul(Node* node);
   Reduction ReduceMathFround(Node* node);
+  Reduction ReduceMathRound(Node* node);
 
   Graph* graph() const;
   JSGraph* jsgraph() const { return jsgraph_; }
@@ -38,7 +43,8 @@
   MachineOperatorBuilder* machine() const;
   SimplifiedOperatorBuilder* simplified() const;
 
-  JSGraph* jsgraph_;
+  JSGraph* const jsgraph_;
+  TypeCache const& type_cache_;
 };
 
 }  // namespace compiler