Remove x86 jump elimination.

src/assembler-ia32.h

Index: src/assembler-ia32.h
diff --git a/src/assembler-ia32.h b/src/assembler-ia32.h
index 7c6786762d53673e36b35b9d2a94473cf810d8fe..84131043804f32e07a0285dcfa9accd3e5935771 100644
--- a/src/assembler-ia32.h
+++ b/src/assembler-ia32.h
@@ -727,14 +727,6 @@ class Assembler : public Malloced {
   // push-pop elimination
   byte* last_pc_;
 
-  // Jump-to-jump elimination:
-  // The last label to be bound to _binding_pos, if unbound.
-  Label unbound_label_;
-  // The position to which _unbound_label has to be bound, if present.
-  int binding_pos_;
-  // The position before which jumps cannot be eliminated.
-  int last_bound_pos_;
-
   // source position information
   int last_position_;
   int last_statement_position_;