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

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

Index: src/compiler/arm/code-generator-arm.cc
diff --git a/src/compiler/arm/code-generator-arm.cc b/src/compiler/arm/code-generator-arm.cc
index 4c5b2924c58275d1a7fefccf29708956673d401f..21415c4dee6a9e85fd6440637d66f4b8e84b07d4 100644
--- a/src/compiler/arm/code-generator-arm.cc
+++ b/src/compiler/arm/code-generator-arm.cc
@@ -1018,17 +1018,12 @@ 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.
-            __ ldr(dst, MemOperand(fp, 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.
-            __ ldr(dst,
-                   MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
+          Heap::RootListIndex index;
+          int offset;
+          if (IsMaterializableFromFrame(src_object, &offset)) {
+            __ ldr(dst, MemOperand(fp, offset));
+          } else if (IsMaterializableFromRoot(src_object, &index)) {
+            __ LoadRoot(dst, index);
           } else {
             __ Move(dst, src_object);
           }