Revert of Fix clobbered register when setting this_function variable.

src/ppc/full-codegen-ppc.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/v8.h"
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 230 matching lines @@
         }
       }
     }
   }
 
   // Possibly set up a local binding to the this function which is used in
   // derived constructors with super calls.
   Variable* this_function_var = scope()->this_function_var();
   if (this_function_var != nullptr) {
     Comment cmnt(masm_, "[ This function");
-    if (!function_in_register) {
-      __ LoadP(r4, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
-      function_in_register = true;
-    }
     SetVar(this_function_var, r4, r3, r5);
   }
 
   Variable* new_target_var = scope()->new_target_var();
   if (new_target_var != nullptr) {
     Comment cmnt(masm_, "[ new.target");
     // new.target is parameter -2.
     int offset = 2 * kPointerSize +
                  (info_->scope()->num_parameters() + 1) * kPointerSize;
     __ LoadP(r3, MemOperand(fp, offset));
@@ skipping 5284 matching lines @@
     return ON_STACK_REPLACEMENT;
   }
 
   DCHECK(interrupt_address ==
          isolate->builtins()->OsrAfterStackCheck()->entry());
   return OSR_AFTER_STACK_CHECK;
 }
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_TARGET_ARCH_PPC