Revert "Revert "Deoptimization-based bce.""

This reverts commit 0ba627337274ccfb8c9cb9bf23fffb1e1b9d1430.

Change-Id: I1ca10d15bbb49897a0cf541ab160431ec180a006
diff --git a/compiler/optimizing/code_generator_x86.h b/compiler/optimizing/code_generator_x86.h
index 6a4d42d..2a26c86 100644
--- a/compiler/optimizing/code_generator_x86.h
+++ b/compiler/optimizing/code_generator_x86.h
@@ -176,6 +176,10 @@
 
   void GenerateImplicitNullCheck(HNullCheck* instruction);
   void GenerateExplicitNullCheck(HNullCheck* instruction);
+  void GenerateTestAndBranch(HInstruction* instruction,
+                             Label* true_target,
+                             Label* false_target,
+                             Label* always_true_target);
 
   X86Assembler* const assembler_;
   CodeGeneratorX86* const codegen_;