Precompilation/mips: Fix SwitchableCalls to use patchable object pool entries for the lookup stubs.

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 448b70a8f7dedf6c9e203b9d22c24566c2c796f3..ded5e74c12e632b663b4cb5ed55dd739b94ddc3d 100644
--- a/runtime/vm/flow_graph_compiler_mips.cc
+++ b/runtime/vm/flow_graph_compiler_mips.cc
@@ -1312,7 +1312,7 @@ void FlowGraphCompiler::EmitSwitchableInstanceCall(
   __ lw(T0, Address(SP, (argument_count - 1) * kWordSize));
   if (ic_data.NumArgsTested() == 1) {
     __ LoadUniqueObject(S5, ic_data);
-    __ BranchLink(*StubCode::ICLookup_entry());
+    __ BranchLinkPatchable(*StubCode::ICLookup_entry());
   } else {
     const String& name = String::Handle(zone(), ic_data.target_name());
     const Array& arguments_descriptor =
@@ -1323,7 +1323,7 @@ void FlowGraphCompiler::EmitSwitchableInstanceCall(
         MegamorphicCacheTable::Lookup(isolate(), name, arguments_descriptor));
 
     __ LoadUniqueObject(S5, cache);
-    __ BranchLink(*StubCode::MegamorphicLookup_entry());
+    __ BranchLinkPatchable(*StubCode::MegamorphicLookup_entry());
   }
   __ jalr(T1);