Various improvements regarding the way we print code code comments.

src/x64/lithium-x64.cc

Index: src/x64/lithium-x64.cc
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index d3651746d2df21d67ed7c05328862d1c6aab1f8c..4cd050dccdd7a64dc90dc3637c0d7451807a9a0c 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -194,6 +194,11 @@ const char* LArithmeticT::Mnemonic() const {
 }
 
 
+bool LGoto::HasInterestingComment(LCodeGen* gen) const {
+  return !gen->IsNextEmittedBlock(block_id());
+}
+
+
 void LGoto::PrintDataTo(StringStream* stream) {
   stream->Add("B%d", block_id());
 }