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

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

Index: src/compiler/arm/code-generator-arm.cc
diff --git a/src/compiler/arm/code-generator-arm.cc b/src/compiler/arm/code-generator-arm.cc
index f278326cf7bbd52648a850aba271c11361b4e5cc..6f8859b1064738bf44104ff1e17a0e7faa9ca56d 100644
--- a/src/compiler/arm/code-generator-arm.cc
+++ b/src/compiler/arm/code-generator-arm.cc
@@ -193,7 +193,7 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       break;
     }
     case kArchJmp:
-      __ b(code_->GetLabel(i.InputBlock(0)));
+      __ b(code_->GetLabel(i.InputRpo(0)));
       DCHECK_EQ(LeaveCC, i.OutputSBit());
       break;
     case kArchNop:
@@ -485,8 +485,10 @@ 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(instr->InputCount() - 2);
-  BasicBlock* fblock = i.InputBlock(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);