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

src/compiler/x64/code-generator-x64.cc

Index: src/compiler/x64/code-generator-x64.cc
diff --git a/src/compiler/x64/code-generator-x64.cc b/src/compiler/x64/code-generator-x64.cc
index fa9f5117ad3ffcc55d6f7903fb938f97c0b1b7a8..441187668b84b6ca4dc00634d4e42e8b2b5978c4 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -233,7 +233,7 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       break;
     }
     case kArchJmp:
-      __ jmp(code_->GetLabel(i.InputBlock(0)));
+      __ jmp(code_->GetLabel(i.InputRpo(0)));
       break;
     case kArchNop:
       // don't emit code for nops.
@@ -583,8 +583,10 @@ void CodeGenerator::AssembleArchBranch(Instruction* instr,
 
   // Emit a branch. The true and false targets are always the last two inputs
   // to the instruction.
-  BasicBlock* tblock = i.InputBlock(static_cast<int>(instr->InputCount()) - 2);
-  BasicBlock* fblock = i.InputBlock(static_cast<int>(instr->InputCount()) - 1);
+  BasicBlock::RpoNumber tblock =
+      i.InputRpo(static_cast<int>(instr->InputCount()) - 2);
+  BasicBlock::RpoNumber fblock =
+      i.InputRpo(static_cast<int>(instr->InputCount()) - 1);
   bool fallthru = IsNextInAssemblyOrder(fblock);
   Label* tlabel = code()->GetLabel(tblock);
   Label* flabel = fallthru ? &done : code()->GetLabel(fblock);