MIPS: [turbofan] Materialize JSFunction from frame if possible.

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 1dee98b9f425c35cf660277a488e772c8de1a18b..7647d24ae98508744090b62b5c2e4a2b85abc10f 100644
--- a/src/compiler/mips/code-generator-mips.cc
+++ b/src/compiler/mips/code-generator-mips.cc
@@ -1138,9 +1138,24 @@ void CodeGenerator::AssembleMove(InstructionOperand* source,
         case Constant::kExternalReference:
           __ li(dst, Operand(src.ToExternalReference()));
           break;
-        case Constant::kHeapObject:
-          __ li(dst, src.ToHeapObject());
+        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.
+            __ lw(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.
+            __ lw(dst,
+                  MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
+          } else {
+            __ li(dst, src_object);
+          }
           break;
+        }
         case Constant::kRpoNumber:
           UNREACHABLE();  // TODO(titzer): loading RPO numbers on mips.
           break;