MIPS64: Fix 'Fix keyed element access wrt string wrappers'.

src/mips64/macro-assembler-mips64.cc

Index: src/mips64/macro-assembler-mips64.cc
diff --git a/src/mips64/macro-assembler-mips64.cc b/src/mips64/macro-assembler-mips64.cc
index 1b0b1e9eafb7df77f55af6b971b04b6231a5260b..83f1a783ff43889a66423c1e3702e1eda187ffd4 100644
--- a/src/mips64/macro-assembler-mips64.cc
+++ b/src/mips64/macro-assembler-mips64.cc
@@ -6216,19 +6216,28 @@ void MacroAssembler::JumpIfDictionaryInPrototypeChain(
   DCHECK(!scratch1.is(scratch0));
   Factory* factory = isolate()->factory();
   Register current = scratch0;
-  Label loop_again;
+  Label loop_again, end;
 
   // Scratch contained elements pointer.
   Move(current, object);
+  ld(current, FieldMemOperand(current, HeapObject::kMapOffset));
+  ld(current, FieldMemOperand(current, Map::kPrototypeOffset));
+  Branch(&end, eq, current, Operand(factory->null_value()));
 
   // Loop based on the map going up the prototype chain.
   bind(&loop_again);
   ld(current, FieldMemOperand(current, HeapObject::kMapOffset));
+  lbu(scratch1, FieldMemOperand(current, Map::kInstanceTypeOffset));
+  STATIC_ASSERT(JS_VALUE_TYPE < JS_OBJECT_TYPE);
+  STATIC_ASSERT(JS_PROXY_TYPE < JS_OBJECT_TYPE);
+  Branch(found, lo, scratch1, Operand(JS_OBJECT_TYPE));
   lb(scratch1, FieldMemOperand(current, Map::kBitField2Offset));
   DecodeField<Map::ElementsKindBits>(scratch1);
   Branch(found, eq, scratch1, Operand(DICTIONARY_ELEMENTS));
   ld(current, FieldMemOperand(current, Map::kPrototypeOffset));
   Branch(&loop_again, ne, current, Operand(factory->null_value()));
+
+  bind(&end);
 }