Revert of Add script context with context-allocated "const this"

src/x87/full-codegen-x87.cc

Index: src/x87/full-codegen-x87.cc
diff --git a/src/x87/full-codegen-x87.cc b/src/x87/full-codegen-x87.cc
index e2abd9d311181c39cf4e8b17f26aea0c4138bf1d..9fbdd03ae0edabea0c190a9be1fbf7bb9908b81b 100644
--- a/src/x87/full-codegen-x87.cc
+++ b/src/x87/full-codegen-x87.cc
@@ -2997,7 +2997,10 @@
 
   // Push the enclosing function.
   __ push(Operand(ebp, JavaScriptFrameConstants::kFunctionOffset));
-
+  // Push the receiver of the enclosing function.
+  Variable* this_var = scope()->LookupThis();
+  DCHECK_NOT_NULL(this_var);
+  __ push(VarOperand(this_var, ecx));
   // Push the language mode.
   __ push(Immediate(Smi::FromInt(language_mode())));
 
@@ -3005,7 +3008,7 @@
   __ push(Immediate(Smi::FromInt(scope()->start_position())));
 
   // Do the runtime call.
-  __ CallRuntime(Runtime::kResolvePossiblyDirectEval, 5);
+  __ CallRuntime(Runtime::kResolvePossiblyDirectEval, 6);
 }
 
 
@@ -3037,8 +3040,8 @@
 
   if (call_type == Call::POSSIBLY_EVAL_CALL) {
     // In a call to eval, we first call RuntimeHidden_ResolvePossiblyDirectEval
-    // to resolve the function we need to call.  Then we call the resolved
-    // function using the given arguments.
+    // to resolve the function we need to call and the receiver of the call.
+    // Then we call the resolved function using the given arguments.
     ZoneList<Expression*>* args = expr->arguments();
     int arg_count = args->length();
     { PreservePositionScope pos_scope(masm()->positions_recorder());
@@ -3055,7 +3058,9 @@
       __ push(Operand(esp, (arg_count + 1) * kPointerSize));
       EmitResolvePossiblyDirectEval(arg_count);
 
-      // Touch up the stack with the resolved function.
+      // The runtime call returns a pair of values in eax (function) and
+      // edx (receiver). Touch up the stack with the right values.
+      __ mov(Operand(esp, (arg_count + 0) * kPointerSize), edx);
       __ mov(Operand(esp, (arg_count + 1) * kPointerSize), eax);
 
       PrepareForBailoutForId(expr->EvalOrLookupId(), NO_REGISTERS);
@@ -4688,10 +4693,9 @@
         context()->Plug(eax);
       } else if (proxy != NULL) {
         Variable* var = proxy->var();
-        // Delete of an unqualified identifier is disallowed in strict mode but
-        // "delete this" is allowed.
-        bool is_this = var->HasThisName(isolate());
-        DCHECK(is_sloppy(language_mode()) || is_this);
+        // Delete of an unqualified identifier is disallowed in strict mode
+        // but "delete this" is allowed.
+        DCHECK(is_sloppy(language_mode()) || var->is_this());
         if (var->IsUnallocated()) {
           __ push(GlobalObjectOperand());
           __ push(Immediate(var->name()));
@@ -4702,7 +4706,7 @@
           // Result of deleting non-global variables is false.  'this' is
           // not really a variable, though we implement it as one.  The
           // subexpression does not have side effects.
-          context()->Plug(is_this);
+          context()->Plug(var->is_this());
         } else {
           // Non-global variable.  Call the runtime to try to delete from the
           // context where the variable was introduced.