Re-land Crankshaft-generated KeyedLoad stubs.

src/x64/lithium-codegen-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 289 matching lines @@
           __ movq(rsi, MemOperand(rsp, kPointerSize));
           __ call(kScratchRegister);
         }
       } else {
         if (needs_frame_not_call.is_bound()) {
           __ jmp(&needs_frame_not_call);
         } else {
           __ bind(&needs_frame_not_call);
           __ push(rbp);
           __ movq(rbp, rsp);
-          __ push(r8);
+          __ push(rsi);
           // This variant of deopt can only be used with stubs. Since we don't
           // have a function pointer to install in the stack frame that we're
           // building, install a special marker there instead.
           ASSERT(info()->IsStub());
           __ Move(rsi, Smi::FromInt(StackFrame::STUB));
           __ push(rsi);
           __ movq(rsi, MemOperand(rsp, kPointerSize));
           __ jmp(kScratchRegister);
         }
       }
@@ skipping 5207 matching lines @@
                                FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64