[turbofan] move assembly order to InstructionBlock

src/compiler/instruction-selector.h

Index: src/compiler/instruction-selector.h
diff --git a/src/compiler/instruction-selector.h b/src/compiler/instruction-selector.h
index ca5e7e3218b58d72f895822b991e14ad076198b6..5e3c52f959bf11da7bf6e1e78cf07f90ec5b77bf 100644
--- a/src/compiler/instruction-selector.h
+++ b/src/compiler/instruction-selector.h
@@ -133,10 +133,6 @@ class InstructionSelector FINAL {
  private:
   friend class OperandGenerator;
 
-  // Checks if {block} will appear directly after {current_block_} when
-  // assembling code, in which case, a fall-through can be used.
-  bool IsNextInAssemblyOrder(const BasicBlock* block) const;
-
   // Inform the instruction selection that {node} was just defined.
   void MarkAsDefined(Node* node);