[turbofan] initial framework for unittesting of register allocator

src/compiler/pipeline.cc

Index: src/compiler/pipeline.cc
diff --git a/src/compiler/pipeline.cc b/src/compiler/pipeline.cc
index d1df843294bbdf6149499c08d854894243458bac..4dab244123d6aef4d34a4abeda1edafb63f71518 100644
--- a/src/compiler/pipeline.cc
+++ b/src/compiler/pipeline.cc
@@ -538,7 +538,10 @@ Handle<Code> Pipeline::GenerateCode(Linkage* linkage, PipelineData* data) {
                                                        data->schedule());
   }
 
-  InstructionSequence sequence(data->instruction_zone(), data->schedule());
+  InstructionBlocks* instruction_blocks =
+      InstructionSequence::InstructionBlocksFor(data->instruction_zone(),
+                                                data->schedule());
+  InstructionSequence sequence(data->instruction_zone(), instruction_blocks);
 
   // Select and schedule instructions covering the scheduled graph.
   {