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

src/compiler/mips64/code-generator-mips64.cc

Index: src/compiler/mips64/code-generator-mips64.cc
diff --git a/src/compiler/mips64/code-generator-mips64.cc b/src/compiler/mips64/code-generator-mips64.cc
index 756cb632da2f59de19c2827aa70039b1618144e1..643483a4d01d8c39d4735270b03e96c701e0ffd6 100644
--- a/src/compiler/mips64/code-generator-mips64.cc
+++ b/src/compiler/mips64/code-generator-mips64.cc
@@ -1206,17 +1206,12 @@ 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.
-            __ ld(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.
-            __ ld(dst,
-                  MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
+          Heap::RootListIndex index;
+          int offset;
+          if (IsMaterializableFromFrame(src_object, &offset)) {
+            __ ld(dst, MemOperand(fp, offset));
+          } else if (IsMaterializableFromRoot(src_object, &index)) {
+            __ LoadRoot(dst, index);
           } else {
             __ li(dst, src_object);
           }