Optimize AOT's switchable calls for the monomorphic case.

runtime/vm/flow_graph_compiler_mips.cc

Index: runtime/vm/flow_graph_compiler_mips.cc
diff --git a/runtime/vm/flow_graph_compiler_mips.cc b/runtime/vm/flow_graph_compiler_mips.cc
index a6f3f140b01644166b9414d6b0f95220dceb7bab..8e568c90feddde7553665af195527cfbe3e1ca01 100644
--- a/runtime/vm/flow_graph_compiler_mips.cc
+++ b/runtime/vm/flow_graph_compiler_mips.cc
@@ -1339,9 +1339,8 @@ void FlowGraphCompiler::EmitMegamorphicInstanceCall(
     __ Comment("Slow case: megamorphic call");
   }
   __ LoadObject(S5, cache);
-  __ lw(T9, Address(THR, Thread::megamorphic_lookup_entry_point_offset()));
+  __ lw(T9, Address(THR, Thread::megamorphic_lookup_checked_entry_offset()));
   __ jalr(T9);
-  __ jalr(T1);
 
   __ Bind(&done);
   RecordSafepoint(locs, slow_path_argument_count);
@@ -1378,12 +1377,16 @@ void FlowGraphCompiler::EmitSwitchableInstanceCall(
     intptr_t deopt_id,
     TokenPosition token_pos,
     LocationSummary* locs) {
+  ASSERT(ic_data.NumArgsTested() == 1);
+  const Code& initial_stub = Code::ZoneHandle(
+      StubCode::ICLookupThroughFunction_entry()->code());
+
   __ Comment("SwitchableCall");
   __ lw(T0, Address(SP, (argument_count - 1) * kWordSize));
-  ASSERT(ic_data.NumArgsTested() == 1);
   __ LoadUniqueObject(S5, ic_data);
-  __ BranchLinkPatchable(*StubCode::ICLookupThroughFunction_entry());
-  __ jalr(T1);
+  __ LoadUniqueObject(CODE_REG, initial_stub);
+  __ lw(T9, FieldAddress(CODE_REG, Code::checked_entry_point_offset()));
+  __ jalr(T9);
 
   AddCurrentDescriptor(RawPcDescriptors::kOther,
       Thread::kNoDeoptId, token_pos);