Improve dead code elimination by transitively marking live code and removing all dead code. Replace…

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index fc57aa879c68111e4158f7db07ebe685c2790110..c6465d2a9684726c2bee7ebcb5573c7f0275844c 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -648,7 +648,6 @@ void HValue::SetOperandAt(int index, HValue* value) {
 void HValue::DeleteAndReplaceWith(HValue* other) {
   // We replace all uses first, so Delete can assert that there are none.
   if (other != NULL) ReplaceAllUsesWith(other);
-  ASSERT(HasNoUses());
   Kill();
   DeleteFromGraph();
 }
@@ -1898,8 +1897,7 @@ void HPhi::PrintTo(StringStream* stream) {
               int32_non_phi_uses() + int32_indirect_uses(),
               double_non_phi_uses() + double_indirect_uses(),
               tagged_non_phi_uses() + tagged_indirect_uses());
-  stream->Add("%s%s]",
-              is_live() ? "_live" : "",
+  stream->Add("%s]",
               IsConvertibleToInteger() ? "" : "_ncti");

[Sven Panne, 2013/05/13 09:31:55]

Nit: This probably fits into the previous line.

[titzer, 2013/05/13 13:29:39]

Done.

[Sven Panne, 2013/05/13 14:55:52]

Not really... ;-)

[titzer, 2013/05/13 18:11:13]

I think I got it this time. :)

 }