Tag handlers as HANDLER rather than STUB.

src/x64/ic-x64.cc

Index: src/x64/ic-x64.cc
diff --git a/src/x64/ic-x64.cc b/src/x64/ic-x64.cc
index 4a7c68a53ca4db309ef6570819df88f3fa94aaa3..15f410c1345e8bbd4dc7db6a46494fa357763ed6 100644
--- a/src/x64/ic-x64.cc
+++ b/src/x64/ic-x64.cc
@@ -1330,7 +1330,7 @@ void LoadIC::GenerateMegamorphic(MacroAssembler* masm) {
 
   // Probe the stub cache.
   Code::Flags flags = Code::ComputeFlags(
-      Code::STUB, MONOMORPHIC, Code::kNoExtraICState,
+      Code::HANDLER, MONOMORPHIC, Code::kNoExtraICState,
       Code::NORMAL, Code::LOAD_IC);
   masm->isolate()->stub_cache()->GenerateProbe(
       masm, flags, rax, rcx, rbx, rdx);
@@ -1451,7 +1451,7 @@ void StoreIC::GenerateMegamorphic(MacroAssembler* masm,
 
   // Get the receiver from the stack and probe the stub cache.
   Code::Flags flags = Code::ComputeFlags(
-      Code::STUB, MONOMORPHIC, strict_mode,
+      Code::HANDLER, MONOMORPHIC, strict_mode,
       Code::NORMAL, Code::STORE_IC);
   masm->isolate()->stub_cache()->GenerateProbe(
       masm, flags, rdx, rcx, rbx, no_reg);