[turbofan] Remove bogus constant materialization from frame.

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 7a964801bbe03eff3d0dffa53b815784754beb16..d8dd8143f3070a76d90d4d5936f01ea1e480d5c9 100644
--- a/src/compiler/mips64/code-generator-mips64.cc
+++ b/src/compiler/mips64/code-generator-mips64.cc
@@ -2332,10 +2332,7 @@ void CodeGenerator::AssembleMove(InstructionOperand* source,
         case Constant::kHeapObject: {
           Handle<HeapObject> src_object = src.ToHeapObject();
           Heap::RootListIndex index;
-          int slot;
-          if (IsMaterializableFromFrame(src_object, &slot)) {
-            __ ld(dst, g.SlotToMemOperand(slot));
-          } else if (IsMaterializableFromRoot(src_object, &index)) {
+          if (IsMaterializableFromRoot(src_object, &index)) {
             __ LoadRoot(dst, index);
           } else {
             __ li(dst, src_object);