[turbofan] move assembly order to InstructionBlock

src/compiler/instruction-selector.cc

Index: src/compiler/instruction-selector.cc
diff --git a/src/compiler/instruction-selector.cc b/src/compiler/instruction-selector.cc
index a0bb6b6a20b718bca1afa98463474bbbb92d5a81..14f08f2729ff7a76c46cf036093c43a7dfaaeebc 100644
--- a/src/compiler/instruction-selector.cc
+++ b/src/compiler/instruction-selector.cc
@@ -173,11 +173,6 @@ Instruction* InstructionSelector::Emit(Instruction* instr) {
 }
 
 
-bool InstructionSelector::IsNextInAssemblyOrder(const BasicBlock* block) const {
-  return current_block_->GetAoNumber().IsNext(block->GetAoNumber());
-}
-
-
 bool InstructionSelector::CanCover(Node* user, Node* node) const {
   return node->OwnedBy(user) &&
          schedule()->block(node) == schedule()->block(user);