[turbofan] remove some of the dependency of Instruction on Schedule

src/compiler/code-generator-impl.h

Index: src/compiler/code-generator-impl.h
diff --git a/src/compiler/code-generator-impl.h b/src/compiler/code-generator-impl.h
index 318b7e96abb3d8362f227eecf0af92be02405f79..92d3b0523f88fd7449146bafb2239c9aa1c881df 100644
--- a/src/compiler/code-generator-impl.h
+++ b/src/compiler/code-generator-impl.h
@@ -6,14 +6,9 @@
 #define V8_COMPILER_CODE_GENERATOR_IMPL_H_
 
 #include "src/compiler/code-generator.h"
-#include "src/compiler/common-operator.h"
-#include "src/compiler/generic-graph.h"
 #include "src/compiler/instruction.h"
 #include "src/compiler/linkage.h"
-#include "src/compiler/machine-operator.h"
-#include "src/compiler/node.h"
 #include "src/compiler/opcodes.h"
-#include "src/compiler/operator.h"
 
 namespace v8 {
 namespace internal {
@@ -61,12 +56,12 @@ class InstructionOperandConverter {
   }
 
   Label* InputLabel(int index) {
-    return gen_->code()->GetLabel(InputBlock(index));
+    return gen_->code()->GetLabel(InputRpo(index));
   }
 
-  BasicBlock* InputBlock(int index) {
-    int block_id = InputInt32(index);
-    return gen_->schedule()->GetBlockById(BasicBlock::Id::FromInt(block_id));
+  BasicBlock::RpoNumber InputRpo(int index) {
+    int rpo_number = InputInt32(index);
+    return BasicBlock::RpoNumber::FromInt(rpo_number);
   }
 
   Register OutputRegister(int index = 0) {