Re-land Crankshaft-generated KeyedLoad stubs.

src/x64/macro-assembler-x64.h

Index: src/x64/macro-assembler-x64.h
diff --git a/src/x64/macro-assembler-x64.h b/src/x64/macro-assembler-x64.h
index 716a591f2e4079cd75b8627e0556c30d2923a3d9..0b95b6798e5cf7b9021252e437bc1c78d2cee9a4 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -79,6 +79,9 @@ struct SmiIndex {
 };
 
 
+void IterateCompiledFrame(const StandardFrame* frame, ObjectVisitor* v);
+
+
 // MacroAssembler implements a collection of frequently used macros.
 class MacroAssembler: public Assembler {
  public:
@@ -1416,7 +1419,8 @@ class MacroAssembler: public Assembler {
 
   // Needs access to SafepointRegisterStackIndex for compiled frame
   // traversal.
-  friend class CompiledFrame;
+  friend void IterateCompiledFrame(const StandardFrame* frame,
+                                   ObjectVisitor* v);
 };