JIT baseline: trigger optimized compilation on hotness threshold.

- Add a new hotness count in the ProfilingInfo to not conflict with
interpreter hotness which may use it for OSR.
- Add a baseline flag in the OatQuickMethodHeader to identify baseline
compiled methods.
- Add a -Xusetieredjit flag to experiment and test.

Bug: 119800099
Test: test.py with Xusetieredjit to true

Change-Id: I8512853f869f1312e3edc60bf64413dee9143c52
diff --git a/compiler/optimizing/code_generator_arm_vixl.h b/compiler/optimizing/code_generator_arm_vixl.h
index 3d4c231..48fb082 100644
--- a/compiler/optimizing/code_generator_arm_vixl.h
+++ b/compiler/optimizing/code_generator_arm_vixl.h
@@ -757,6 +757,7 @@
   }
 
   void MaybeGenerateInlineCacheCheck(HInstruction* instruction, vixl32::Register klass);
+  void MaybeIncrementHotness(bool is_frame_entry);
 
  private:
   // Encoding of thunk type and data for link-time generated thunks for Baker read barriers.