[turbofan] Remove bogus constant materialization from frame.

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

Index: src/compiler/mips/code-generator-mips.cc
diff --git a/src/compiler/mips/code-generator-mips.cc b/src/compiler/mips/code-generator-mips.cc
index 61d57bc46e8cae6a0ddc4669b99f71d3e48220c6..212f57b40e9b41193599587294b40626ffd2e6c3 100644
--- a/src/compiler/mips/code-generator-mips.cc
+++ b/src/compiler/mips/code-generator-mips.cc
@@ -2010,10 +2010,7 @@ void CodeGenerator::AssembleMove(InstructionOperand* source,
         case Constant::kHeapObject: {
           Handle<HeapObject> src_object = src.ToHeapObject();
           Heap::RootListIndex index;
-          int slot;
-          if (IsMaterializableFromFrame(src_object, &slot)) {
-            __ lw(dst, g.SlotToMemOperand(slot));
-          } else if (IsMaterializableFromRoot(src_object, &index)) {
+          if (IsMaterializableFromRoot(src_object, &index)) {
             __ LoadRoot(dst, index);
           } else {
             __ li(dst, src_object);