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

src/compiler/code-generator.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/code-generator.h"
 
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/pipeline.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 CodeGenerator::CodeGenerator(InstructionSequence* code)
     : code_(code),
-      current_block_(NULL),
+      current_block_(BasicBlock::RpoNumber::Invalid()),
       current_source_position_(SourcePosition::Invalid()),
       masm_(code->zone()->isolate(), NULL, 0),
       resolver_(this),
       safepoints_(code->zone()),
       deoptimization_states_(code->zone()),
       deoptimization_literals_(code->zone()),
       translations_(code->zone()),
       last_lazy_deopt_pc_(0) {}
 
 
@@ skipping 68 matching lines @@
       safepoint.DefinePointerRegister(reg, zone());
     }
   }
 }
 
 
 void CodeGenerator::AssembleInstruction(Instruction* instr) {
   if (instr->IsBlockStart()) {
     // Bind a label for a block start and handle parallel moves.
     BlockStartInstruction* block_start = BlockStartInstruction::cast(instr);
-    current_block_ = block_start->block();
+    current_block_ = block_start->rpo_number();
     if (FLAG_code_comments) {
       // TODO(titzer): these code comments are a giant memory leak.
       Vector<char> buffer = Vector<char>::New(32);
-      SNPrintF(buffer, "-- B%d start --", block_start->block()->id().ToInt());
+      // TODO(dcarney): should not be rpo number there
+      SNPrintF(buffer, "-- B%d (rpo) start --", current_block_.ToInt());
       masm()->RecordComment(buffer.start());
     }
     masm()->bind(block_start->label());
   }
   if (instr->IsGapMoves()) {
     // Handle parallel moves associated with the gap instruction.
     AssembleGap(GapInstruction::cast(instr));
   } else if (instr->IsSourcePosition()) {
     AssembleSourcePosition(SourcePositionInstruction::cast(instr));
   } else {
@@ skipping 384 matching lines @@
 }
 
 
 void CodeGenerator::AddNopForSmiCodeInlining() { UNIMPLEMENTED(); }
 
 #endif  // !V8_TURBOFAN_BACKEND
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8