Revert^4 "Compiler changes for bitstring based type checks."

Disabled the build time flag. (No image version bump needed.)

Bug: 26687569
Bug: 64692057
Bug: 76420366

This reverts commit 3fbd3ad99fad077e5c760e7238bcd55b07d4c06e.

Change-Id: I5d83c4ce8a7331c435d5155ac6e0ce1c77d60004
diff --git a/compiler/optimizing/code_generator_arm_vixl.h b/compiler/optimizing/code_generator_arm_vixl.h
index 6a07e36..2114ea1 100644
--- a/compiler/optimizing/code_generator_arm_vixl.h
+++ b/compiler/optimizing/code_generator_arm_vixl.h
@@ -322,6 +322,9 @@
   void GenerateSuspendCheck(HSuspendCheck* instruction, HBasicBlock* successor);
   void GenerateClassInitializationCheck(LoadClassSlowPathARMVIXL* slow_path,
                                         vixl32::Register class_reg);
+  void GenerateBitstringTypeCheckCompare(HTypeCheckInstruction* check,
+                                         vixl::aarch32::Register temp,
+                                         vixl::aarch32::FlagsUpdate flags_update);
   void GenerateAndConst(vixl::aarch32::Register out, vixl::aarch32::Register first, uint32_t value);
   void GenerateOrrConst(vixl::aarch32::Register out, vixl::aarch32::Register first, uint32_t value);
   void GenerateEorConst(vixl::aarch32::Register out, vixl::aarch32::Register first, uint32_t value);