Unify SoftDeoptimize and Deoptimize hydrogen instructions

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 c64533cdfcbd10201c743179160bbb1efc888667..84cb6d284c52a365d4a407ea9c33a002a5c3e1bf 100644
--- a/src/mips/lithium-mips.cc
+++ b/src/mips/lithium-mips.cc
@@ -706,11 +706,6 @@ LInstruction* LChunkBuilder::DoEnvironmentMarker(HEnvironmentMarker* instr) {
 }
 
 
-LInstruction* LChunkBuilder::DoSoftDeoptimize(HSoftDeoptimize* instr) {
-  return AssignEnvironment(new(zone()) LDeoptimize);
-}
-
-
 LInstruction* LChunkBuilder::DoDeoptimize(HDeoptimize* instr) {
   return AssignEnvironment(new(zone()) LDeoptimize);
 }