Don't use the keyed slow stub for named handlers.

src/ic/mips/ic-mips.cc

Index: src/ic/mips/ic-mips.cc
diff --git a/src/ic/mips/ic-mips.cc b/src/ic/mips/ic-mips.cc
index 389fa57dbcabfd28bfb2d6e7ff4a8fdcfc221232..46de1fd36f9b112df7c744f0383e92306509b09d 100644
--- a/src/ic/mips/ic-mips.cc
+++ b/src/ic/mips/ic-mips.cc
@@ -421,7 +421,7 @@ void KeyedLoadIC::GenerateMegamorphic(MacroAssembler* masm) {
 
   Code::Flags flags =
       Code::RemoveHolderFromFlags(Code::ComputeHandlerFlags(Code::LOAD_IC));
-  masm->isolate()->stub_cache()->GenerateProbe(masm, Code::LOAD_IC, flags,
+  masm->isolate()->stub_cache()->GenerateProbe(masm, Code::KEYED_LOAD_IC, flags,
                                                receiver, key, t0, t1, t2, t5);
   // Cache miss.
   GenerateMiss(masm);
@@ -665,8 +665,8 @@ void KeyedStoreIC::GenerateMegamorphic(MacroAssembler* masm,
 
   Code::Flags flags =
       Code::RemoveHolderFromFlags(Code::ComputeHandlerFlags(Code::STORE_IC));
-  masm->isolate()->stub_cache()->GenerateProbe(masm, Code::STORE_IC, flags,
-                                               receiver, key, t1, t2, t4, t5);
+  masm->isolate()->stub_cache()->GenerateProbe(
+      masm, Code::KEYED_STORE_IC, flags, receiver, key, t1, t2, t4, t5);
   // Cache miss.
   __ Branch(&miss);