X87: Fix issue with __proto__ when using ES6 object literals.

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 6bca8a0cee8d5dce7d9fd28375a2d74132bcd307..33ae5a1c53f4448689a64712b3c154eab2d66240 100644
--- a/src/x87/full-codegen-x87.cc
+++ b/src/x87/full-codegen-x87.cc
@@ -2456,8 +2456,9 @@ void FullCodeGenerator::EmitClassDefineProperties(ClassLiteral* lit) {
     switch (property->kind()) {
       case ObjectLiteral::Property::CONSTANT:
       case ObjectLiteral::Property::MATERIALIZED_LITERAL:
-      case ObjectLiteral::Property::COMPUTED:
       case ObjectLiteral::Property::PROTOTYPE:
+        UNREACHABLE();
+      case ObjectLiteral::Property::COMPUTED:
         __ CallRuntime(Runtime::kDefineClassMethod, 3);
         break;
 
@@ -2468,9 +2469,6 @@ void FullCodeGenerator::EmitClassDefineProperties(ClassLiteral* lit) {
       case ObjectLiteral::Property::SETTER:
         __ CallRuntime(Runtime::kDefineSetterPropertyUnchecked, 3);
         break;
-
-      default:
-        UNREACHABLE();
     }
   }