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

src/ic/mips64/ic-mips64.cc

Index: src/ic/mips64/ic-mips64.cc
diff --git a/src/ic/mips64/ic-mips64.cc b/src/ic/mips64/ic-mips64.cc
index 7c81c8c6787c781d4f1fd6deecb7e9aa760e8903..3f1a16cfde7c4a3c362b8a9a26892a88dbf4d8b1 100644
--- a/src/ic/mips64/ic-mips64.cc
+++ b/src/ic/mips64/ic-mips64.cc
@@ -420,7 +420,7 @@ 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, a4, a5, a6, t1);
   // Cache miss.
   GenerateMiss(masm);
@@ -669,8 +669,8 @@ 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, a5, a6, a7, t0);
+  masm->isolate()->stub_cache()->GenerateProbe(
+      masm, Code::KEYED_STORE_IC, flags, receiver, key, a5, a6, a7, t0);
   // Cache miss.
   __ Branch(&miss);