Enable stub generation using Hydrogen/Lithium (again)

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index feac1be0bcfcdf45f6c435f7899acd645d24e4e8..4d3f5e1009b06051c3c8111436b0c3c5dc73b50f 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -379,7 +379,12 @@ intptr_t HValue::Hashcode() {
   intptr_t result = opcode();
   int count = OperandCount();
   for (int i = 0; i < count; ++i) {
-    result = result * 19 + OperandAt(i)->id() + (result >> 7);
+    HValue* operand = OperandAt(i);

[Jakob Kummerow, 2012/11/19 12:36:00]

as discussed, just pass in any existing HValue as fake dependency, so you don't
need this code.
If you do keep it, replace OperandAt(i) below with |operand| ;-)

[danno, 2012/11/26 17:16:18]

Done.

+    if (operand != NULL) {
+      result = result * 19 + OperandAt(i)->id() + (result >> 7);
+    } else {
+      result = result * 19 + (result >> 7);
+    }
   }
   return result;
 }
@@ -937,8 +942,10 @@ void HChange::PrintDataTo(StringStream* stream) {
 
 void HJSArrayLength::PrintDataTo(StringStream* stream) {
   value()->PrintNameTo(stream);
-  stream->Add(" ");
-  typecheck()->PrintNameTo(stream);
+  if (typecheck() != NULL) {
+    stream->Add(" ");
+    typecheck()->PrintNameTo(stream);
+  }
 }
 
 
@@ -1051,7 +1058,9 @@ void HCheckInstanceType::GetCheckMaskAndTag(uint8_t* mask, uint8_t* tag) {
 void HLoadElements::PrintDataTo(StringStream* stream) {
   value()->PrintNameTo(stream);
   stream->Add(" ");
-  typecheck()->PrintNameTo(stream);
+  if (typecheck() != NULL) {
+    typecheck()->PrintNameTo(stream);
+  }
 }
 
 
@@ -1853,7 +1862,9 @@ void HLoadKeyed::PrintDataTo(StringStream* stream) {
   stream->Add("[");
   key()->PrintNameTo(stream);
   stream->Add("] ");
-  dependency()->PrintNameTo(stream);
+  if (dependency() != NULL) {
+    dependency()->PrintNameTo(stream);
+  }
   if (RequiresHoleCheck()) {
     stream->Add(" check_hole");
   }