Optimize AOT's switchable calls for the monomorphic case.

runtime/vm/snapshot.cc

Index: runtime/vm/snapshot.cc
diff --git a/runtime/vm/snapshot.cc b/runtime/vm/snapshot.cc
index 6a4371fd7ab42aa325c9ecc3abbf4dd9559b9c92..d6891e27c9ebdc4527c9228ebe39f31db6a8dd2e 100644
--- a/runtime/vm/snapshot.cc
+++ b/runtime/vm/snapshot.cc
@@ -776,7 +776,7 @@ void AssemblyInstructionsWriter::Write() {
     // 2. Write a label at the entry point.
     owner = code.owner();
     if (owner.IsNull()) {
-      const char* name = StubCode::NameOfStub(insns.EntryPoint());
+      const char* name = StubCode::NameOfStub(insns.UncheckedEntryPoint());
       assembly_stream_.Print("Precompiled_Stub_%s:\n", name);
     } else if (owner.IsClass()) {
       str = Class::Cast(owner).Name();