Remove some dead code from full-codegen on all platforms.

src/mips/full-codegen-mips.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 734 matching lines @@
           // No initial value!
           __ mov(a0, zero_reg);  // Operand(Smi::FromInt(0)));
           __ Push(cp, a2, a1, a0);
         }
         __ CallRuntime(Runtime::kDeclareContextSlot, 4);
         break;
       }
     }
 
   } else if (prop != NULL) {
-    if (function != NULL || mode == Variable::CONST) {
-      // We are declaring a function or constant that rewrites to a
-      // property.  Use (keyed) IC to set the initial value.  We
-      // cannot visit the rewrite because it's shared and we risk
-      // recording duplicate AST IDs for bailouts from optimized code.
+    // A const declaration aliasing a parameter is a illegal redeclaration.
+    ASSERT(mode != Variable::CONST);
+    // Do nothing for a regular var declaration.
+    // Store the function for a function declaration.
+    if (function != NULL) {
+      // We are declaring a function that rewrites to a property.
+      // Use (keyed) IC to set the initial value.  We cannot visit the
+      // rewrite because it's shared and we risk recording duplicate AST
+      // IDs for bailouts from optimized code.
       ASSERT(prop->obj()->AsVariableProxy() != NULL);
       { AccumulatorValueContext for_object(this);
         EmitVariableLoad(prop->obj()->AsVariableProxy()->var());
       }
-      if (function != NULL) {
-        __ push(result_register());
-        VisitForAccumulatorValue(function);
-        __ mov(a0, result_register());
-        __ pop(a2);
-      } else {
-        __ mov(a2, result_register());
-        __ LoadRoot(a0, Heap::kTheHoleValueRootIndex);
-      }
+
+      __ push(result_register());
+      VisitForAccumulatorValue(function);
+      __ mov(a0, result_register());
+      __ pop(a2);
+
       ASSERT(prop->key()->AsLiteral() != NULL &&
              prop->key()->AsLiteral()->handle()->IsSmi());
       __ li(a1, Operand(prop->key()->AsLiteral()->handle()));
 
       Handle<Code> ic = is_strict_mode()
           ? isolate()->builtins()->KeyedStoreIC_Initialize_Strict()
           : isolate()->builtins()->KeyedStoreIC_Initialize();
       EmitCallIC(ic, RelocInfo::CODE_TARGET, AstNode::kNoNumber);
       // Value in v0 is ignored (declarations are statements).
     }
@@ skipping 3581 matching lines @@
   __ Addu(at, a1, Operand(masm_->CodeObject()));
   __ Jump(at);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS