[turbofan] Output file for C1 visualizer.

src/compiler/instruction.cc

Index: src/compiler/instruction.cc
diff --git a/src/compiler/instruction.cc b/src/compiler/instruction.cc
index 635a6bde27808a49363d79770635139b2d03a8c4..63830e51db998c708801f243045a0597f7b9d616 100644
--- a/src/compiler/instruction.cc
+++ b/src/compiler/instruction.cc
@@ -291,7 +291,7 @@ std::ostream& operator<<(std::ostream& os, const Instruction& instr) {
       os << " " << *instr.InputAt(i);
     }
   }
-  return os << "\n";
+  return os;
 }
 
 
@@ -563,7 +563,7 @@ std::ostream& operator<<(std::ostream& os, const InstructionSequence& code) {
          j <= block->last_instruction_index(); j++) {
       // TODO(svenpanne) Add some basic formatting to our streams.
       SNPrintF(buf, "%5d", j);
-      os << "   " << buf.start() << ": " << *code.InstructionAt(j);
+      os << "   " << buf.start() << ": " << *code.InstructionAt(j) << "\n";
     }
 
     os << "  " << block->control();