Revert of PPC: Resolve references to "this" the same way as normal variables

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 106 matching lines @@
   if (strlen(FLAG_stop_at) > 0 &&
       info->function()->name()->IsUtf8EqualTo(CStrVector(FLAG_stop_at))) {
     __ stop("stop-at");
   }
 #endif
 
   // Sloppy mode functions and builtins need to replace the receiver with the
   // global proxy when called as functions (without an explicit receiver
   // object).
   if (is_sloppy(info->language_mode()) && !info->is_native() &&
-      info->MayUseThis() && info->scope()->has_this_declaration()) {
+      info->MayUseThis()) {
     Label ok;
     int receiver_offset = info->scope()->num_parameters() * kPointerSize;
     __ LoadP(r5, MemOperand(sp, receiver_offset), r0);
     __ CompareRoot(r5, Heap::kUndefinedValueRootIndex);
     __ bne(&ok);
 
     __ LoadP(r5, GlobalObjectOperand());
     __ LoadP(r5, FieldMemOperand(r5, GlobalObject::kGlobalProxyOffset));
 
     __ StoreP(r5, MemOperand(sp, receiver_offset), r0);
@@ skipping 76 matching lines @@
       __ push(r4);
       __ CallRuntime(Runtime::kNewFunctionContext, 1);
     }
     function_in_register = false;
     // Context is returned in r3.  It replaces the context passed to us.
     // It's saved in the stack and kept live in cp.
     __ mr(cp, r3);
     __ StoreP(r3, MemOperand(fp, StandardFrameConstants::kContextOffset));
     // Copy any necessary parameters into the context.
     int num_parameters = info->scope()->num_parameters();
-    int first_parameter = info->scope()->has_this_declaration() ? -1 : 0;
-    for (int i = first_parameter; i < num_parameters; i++) {
-      Variable* var = (i == -1) ? scope()->receiver() : scope()->parameter(i);
+    for (int i = 0; i < num_parameters; i++) {
+      Variable* var = scope()->parameter(i);
       if (var->IsContextSlot()) {
         int parameter_offset = StandardFrameConstants::kCallerSPOffset +
                                (num_parameters - 1 - i) * kPointerSize;
         // Load parameter from stack.
         __ LoadP(r3, MemOperand(fp, parameter_offset), r0);
         // Store it in the context.
         MemOperand target = ContextOperand(cp, var->index());
         __ StoreP(r3, target, r0);
 
         // Update the write barrier.
@@ skipping 2806 matching lines @@
   if (arg_count > 0) {
     __ LoadP(r8, MemOperand(sp, arg_count * kPointerSize), r0);
   } else {
     __ LoadRoot(r8, Heap::kUndefinedValueRootIndex);
   }
 
   // r7: the receiver of the enclosing function.
   __ LoadP(r7, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
 
   // r6: the receiver of the enclosing function.
-  Variable* this_var = scope()->LookupThis();
-  DCHECK_NOT_NULL(this_var);
-  GetVar(r6, this_var);
+  int receiver_offset = 2 + info_->scope()->num_parameters();
+  __ LoadP(r6, MemOperand(fp, receiver_offset * kPointerSize), r0);
 
   // r5: language mode.
   __ LoadSmiLiteral(r5, Smi::FromInt(language_mode()));
 
   // r4: the start position of the scope the calls resides in.
   __ LoadSmiLiteral(r4, Smi::FromInt(scope()->start_position()));
 
   // Do the runtime call.
   __ Push(r8, r7, r6, r5, r4);
   __ CallRuntime(Runtime::kResolvePossiblyDirectEval, 6);
@@ skipping 2385 matching lines @@
     return ON_STACK_REPLACEMENT;
   }
 
   DCHECK(interrupt_address ==
          isolate->builtins()->OsrAfterStackCheck()->entry());
   return OSR_AFTER_STACK_CHECK;
 }
 }
 }  // namespace v8::internal
 #endif  // V8_TARGET_ARCH_PPC