[runtime] Throw if attempting to re-declaring an accessor.

src/runtime/runtime-scopes.cc

Index: src/runtime/runtime-scopes.cc
diff --git a/src/runtime/runtime-scopes.cc b/src/runtime/runtime-scopes.cc
index f634cc119d80bc1f3bf739985d310a72225d67b9..3161b83455ffafb2ee9f817f2c2126146dcae305 100644
--- a/src/runtime/runtime-scopes.cc
+++ b/src/runtime/runtime-scopes.cc
@@ -88,8 +88,7 @@ Object* DeclareGlobal(
       // function.
       PropertyDetails old_details = it.property_details();
       if (old_details.IsReadOnly() || old_details.IsDontEnum() ||
-          (it.state() == LookupIterator::ACCESSOR &&
-           it.GetAccessors()->IsAccessorPair())) {
+          (it.state() == LookupIterator::ACCESSOR)) {
         // ECMA-262 section 15.1.11 GlobalDeclarationInstantiation 5.d:
         // If hasRestrictedGlobal is true, throw a SyntaxError exception.
         // ECMA-262 section 18.2.1.3 EvalDeclarationInstantiation 8.a.iv.1.b: