Reduce size of LIR instruction by one word and remove dead code.

src/arm/lithium-codegen-arm.cc

Index: src/arm/lithium-codegen-arm.cc
===================================================================
--- src/arm/lithium-codegen-arm.cc	(revision 11356)
+++ src/arm/lithium-codegen-arm.cc	(working copy)
@@ -2267,8 +2267,7 @@
                   RelocInfo::CODE_TARGET,
                   instr,
                   RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS);
-  ASSERT(instr->HasDeoptimizationEnvironment());
-  LEnvironment* env = instr->deoptimization_environment();
+  LEnvironment* env = instr->GetDeferredLazyDeoptimizationEnvironment();
   safepoints_.RecordLazyDeoptimizationIndex(env->deoptimization_index());
   // Put the result value into the result register slot and
   // restore all registers.
@@ -2886,7 +2885,7 @@
   __ b(ne, &loop);
 
   __ bind(&invoke);
-  ASSERT(instr->HasPointerMap() && instr->HasDeoptimizationEnvironment());
+  ASSERT(instr->HasPointerMap());
   LPointerMap* pointers = instr->pointer_map();
   RecordPosition(pointers->position());
   SafepointGenerator safepoint_generator(
@@ -3433,7 +3432,6 @@
 void LCodeGen::DoInvokeFunction(LInvokeFunction* instr) {
   ASSERT(ToRegister(instr->function()).is(r1));
   ASSERT(instr->HasPointerMap());
-  ASSERT(instr->HasDeoptimizationEnvironment());
   LPointerMap* pointers = instr->pointer_map();
   RecordPosition(pointers->position());
   SafepointGenerator generator(this, pointers, Safepoint::kLazyDeopt);
@@ -4981,7 +4979,7 @@
   Register strict = scratch0();
   __ mov(strict, Operand(Smi::FromInt(strict_mode_flag())));
   __ Push(object, key, strict);
-  ASSERT(instr->HasPointerMap() && instr->HasDeoptimizationEnvironment());
+  ASSERT(instr->HasPointerMap());
   LPointerMap* pointers = instr->pointer_map();
   RecordPosition(pointers->position());
   SafepointGenerator safepoint_generator(
@@ -4994,7 +4992,7 @@
   Register obj = ToRegister(instr->object());
   Register key = ToRegister(instr->key());
   __ Push(key, obj);
-  ASSERT(instr->HasPointerMap() && instr->HasDeoptimizationEnvironment());
+  ASSERT(instr->HasPointerMap());
   LPointerMap* pointers = instr->pointer_map();
   RecordPosition(pointers->position());
   SafepointGenerator safepoint_generator(this, pointers, Safepoint::kLazyDeopt);