Restore performance of accesses to JSGlobalProxy after r22802

src/mips64/stub-cache-mips64.cc

Index: src/mips64/stub-cache-mips64.cc
diff --git a/src/mips64/stub-cache-mips64.cc b/src/mips64/stub-cache-mips64.cc
index 939c28faa0d8d0606b261ea49b9eba732c5bb683..c2efd97b0bb85a7f12dc75ffd954eaa588504351 100644
--- a/src/mips64/stub-cache-mips64.cc
+++ b/src/mips64/stub-cache-mips64.cc
@@ -743,8 +743,8 @@ Register PropertyHandlerCompiler::CheckPrototypes(
 
     prototype = handle(JSObject::cast(current_map->prototype()));
     if (current_map->is_dictionary_map() &&
-        !current_map->IsJSGlobalObjectMap() &&
-        !current_map->IsJSGlobalProxyMap()) {
+        !current_map->IsJSGlobalObjectMap()) {
+      DCHECK(!current_map->IsJSGlobalProxyMap());  // Proxy maps are fast.
       if (!name->IsUniqueName()) {
         DCHECK(name->IsString());
         name = factory()->InternalizeString(Handle<String>::cast(name));
@@ -777,6 +777,9 @@ Register PropertyHandlerCompiler::CheckPrototypes(
       // Check access rights to the global object.  This has to happen after
       // the map check so that we know that the object is actually a global
       // object.
+      // This allows us to install generated handlers for accesses to the
+      // global proxy (as opposed to using slow ICs). See corresponding code
+      // in LookupForRead().
       if (current_map->IsJSGlobalProxyMap()) {
         __ CheckAccessGlobalProxy(reg, scratch2, miss);
       } else if (current_map->IsJSGlobalObjectMap()) {