Liveness analysis for environment slots in Hydrogen

src/ia32/lithium-ia32.cc

Index: src/ia32/lithium-ia32.cc
diff --git a/src/ia32/lithium-ia32.cc b/src/ia32/lithium-ia32.cc
index dec5697f8769b861b8d72e2b44ec9647695e8cc5..c6d79fe0ae4b7831cd6d7d3ac5c5916524a4fef5 100644
--- a/src/ia32/lithium-ia32.cc
+++ b/src/ia32/lithium-ia32.cc
@@ -758,6 +758,12 @@ LInstruction* LChunkBuilder::DoDummyUse(HDummyUse* instr) {
 }
 
 
+LInstruction* LChunkBuilder::DoEnvironmentMarker(HEnvironmentMarker* instr) {
+  UNREACHABLE();
+  return NULL;
+}
+
+
 LInstruction* LChunkBuilder::DoSoftDeoptimize(HSoftDeoptimize* instr) {
   return AssignEnvironment(new(zone()) LDeoptimize);
 }