Various improvements regarding the way we print code code comments.

src/lithium.cc

Index: src/lithium.cc
diff --git a/src/lithium.cc b/src/lithium.cc
index b4a57f520bc8fa464f3d61ecb8262254b71563ee..9f50d6c72502ee05891e90e087e9dca10a6c1028 100644
--- a/src/lithium.cc
+++ b/src/lithium.cc
@@ -341,6 +341,7 @@ void LChunk::MarkEmptyBlocks() {
 
 void LChunk::AddInstruction(LInstruction* instr, HBasicBlock* block) {
   LInstructionGap* gap = new(graph_->zone()) LInstructionGap(block);
+  gap->set_hydrogen_value(instr->hydrogen_value());
   int index = -1;
   if (instr->IsControl()) {
     instructions_.Add(gap, zone());