VM: Remove collection of unused range feedback.

runtime/vm/assembler_x64.h

Index: runtime/vm/assembler_x64.h
diff --git a/runtime/vm/assembler_x64.h b/runtime/vm/assembler_x64.h
index f31d37bcda6e8cef4c751179017c09b50314632c..c865814f3a1c3c37e8ca31c0beb68f39d23251f5 100644
--- a/runtime/vm/assembler_x64.h
+++ b/runtime/vm/assembler_x64.h
@@ -861,14 +861,6 @@ class Assembler : public ValueObject {
     sarq(reg, Immediate(kSmiTagSize));
   }
 
-  void ComputeRange(Register result, Register value, Label* miss);
-  void UpdateRangeFeedback(Register value,
-                           intptr_t index,
-                           Register ic_data,
-                           Register scratch,
-                           Label* miss);
-
-  int PreferredLoopAlignment() { return 16; }
   void Align(int alignment, intptr_t offset);
   void Bind(Label* label);
   void Jump(Label* label) { jmp(label); }