Add roundsd instruction to ia32 and use it in optimized Math.floor.

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
===================================================================
--- src/hydrogen-instructions.cc	(revision 8916)
+++ src/hydrogen-instructions.cc	(working copy)
@@ -635,6 +635,12 @@
 }
 
 
+void HBoundsCheck::PrintDataTo(StringStream* stream) {
+  index()->PrintNameTo(stream);
+  stream->Add(" ");
+  length()->PrintNameTo(stream);
+}
+
 void HCallConstantFunction::PrintDataTo(StringStream* stream) {
   if (IsApplyFunction()) {
     stream->Add("optimized apply ");
@@ -1364,6 +1370,20 @@
 }
 
 
+void HLoadNamedFieldPolymorphic::PrintDataTo(StringStream* stream) {
+  object()->PrintNameTo(stream);
+  stream->Add(" .");
+  stream->Add(*String::cast(*name())->ToCString());
+}
+
+
+void HLoadNamedGeneric::PrintDataTo(StringStream* stream) {
+  object()->PrintNameTo(stream);
+  stream->Add(" .");
+  stream->Add(*String::cast(*name())->ToCString());
+}
+
+
 void HLoadKeyedFastElement::PrintDataTo(StringStream* stream) {
   object()->PrintNameTo(stream);
   stream->Add("[");