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 e78cee48379c04e9e972b597b527d4c98bd60e70..f564e1cbab026e26568c3acc8a6c9298bab211fc 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());
 }