[turbofan] Materialize JSFunction from frame if possible.

src/compiler/arm64/code-generator-arm64.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/code-generator.h"
 
 #include "src/arm64/macro-assembler-arm64.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 1108 matching lines @@
       __ Ldr(temp, src);
       __ Str(temp, g.ToMemOperand(destination, masm()));
     }
   } else if (source->IsConstant()) {
     Constant src = g.ToConstant(ConstantOperand::cast(source));
     if (destination->IsRegister() || destination->IsStackSlot()) {
       UseScratchRegisterScope scope(masm());
       Register dst = destination->IsRegister() ? g.ToRegister(destination)
                                                : scope.AcquireX();
       if (src.type() == Constant::kHeapObject) {
-        __ LoadObject(dst, src.ToHeapObject());
+        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));
+        } else {
+          __ LoadObject(dst, src_object);
+        }
       } else {
         __ Mov(dst, g.ToImmediate(source));
       }
       if (destination->IsStackSlot()) {
         __ Str(dst, g.ToMemOperand(destination, masm()));
       }
     } else if (src.type() == Constant::kFloat32) {
       if (destination->IsDoubleRegister()) {
         FPRegister dst = g.ToDoubleRegister(destination).S();
         __ Fmov(dst, src.ToFloat32());
@@ skipping 127 matching lines @@
     }
   }
   MarkLazyDeoptSite();
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8