[turbofan] Load immortal heap objects from the heap roots.

src/compiler/x64/code-generator-x64.cc

Index: src/compiler/x64/code-generator-x64.cc
diff --git a/src/compiler/x64/code-generator-x64.cc b/src/compiler/x64/code-generator-x64.cc
index 4213c9f135131957dc51e93505a2b7f4444df20f..f4b90e92624750a8148953cb0dd27dcabfcd62ee 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -1531,17 +1531,12 @@ void CodeGenerator::AssembleMove(InstructionOperand* source,
           break;
         case Constant::kHeapObject: {
           Handle<HeapObject> src_object = src.ToHeapObject();
-          if (info()->IsOptimizing() &&
-              src_object.is_identical_to(info()->context())) {
-            // Loading the context from the frame is way cheaper than
-            // materializing the actual context heap object address.
-            __ movp(dst, Operand(rbp, StandardFrameConstants::kContextOffset));
-          } else if (info()->IsOptimizing() &&
-                     src_object.is_identical_to(info()->closure())) {
-            // Loading the JSFunction from the frame is way cheaper than
-            // materializing the actual JSFunction heap object address.
-            __ movp(dst,
-                    Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
+          Heap::RootListIndex index;
+          int offset;
+          if (IsMaterializableFromFrame(src_object, &offset)) {
+            __ movp(dst, Operand(rbp, offset));
+          } else if (IsMaterializableFromRoot(src_object, &index)) {
+            __ LoadRoot(dst, index);
           } else {
             __ Move(dst, src_object);
           }