Liveness analysis for environment slots in Hydrogen

src/mips/lithium-mips.cc

Index: src/mips/lithium-mips.cc
diff --git a/src/mips/lithium-mips.cc b/src/mips/lithium-mips.cc
index 5ca8cd9b96c69fef24d28a699391eb7c267061d5..ea1f84d6619d32f0558d67d2ea1bf66e827eefb6 100644
--- a/src/mips/lithium-mips.cc
+++ b/src/mips/lithium-mips.cc
@@ -703,6 +703,12 @@ LInstruction* LChunkBuilder::DoDummyUse(HDummyUse* instr) {
 }
 
 
+LInstruction* LChunkBuilder::DoEnvironmentMarker(HEnvironmentMarker* instr) {
+  UNREACHABLE();
+  return NULL;
+}
+
+
 LInstruction* LChunkBuilder::DoSoftDeoptimize(HSoftDeoptimize* instr) {
   return AssignEnvironment(new(zone()) LDeoptimize);
 }