Synchronize with r15594.

src/a64/lithium-a64.cc

Index: src/a64/lithium-a64.cc
diff --git a/src/a64/lithium-a64.cc b/src/a64/lithium-a64.cc
index 76d1325d17fcd9319206bac83e3d4a49e174e38a..8a1bdceba9e122280937412d00b16f1716f6b913 100644
--- a/src/a64/lithium-a64.cc
+++ b/src/a64/lithium-a64.cc
@@ -1386,11 +1386,6 @@ LInstruction* LChunkBuilder::DoDeclareGlobals(HDeclareGlobals* instr) {
 }
 
 
-LInstruction* LChunkBuilder::DoDeleteProperty(HDeleteProperty* instr) {
-  UNIMPLEMENTED_INSTRUCTION();
-}
-
-
 LInstruction* LChunkBuilder::DoDeoptimize(HDeoptimize* instr) {
   return AssignEnvironment(new(zone()) LDeoptimize);
 }
@@ -1511,14 +1506,6 @@ LInstruction* LChunkBuilder::DoHasInstanceTypeAndBranch(
 }
 
 
-LInstruction* LChunkBuilder::DoIn(HIn* instr) {
-  LOperand* key = UseRegisterAtStart(instr->key());
-  LOperand* object = UseRegisterAtStart(instr->object());
-  LIn* result = new(zone()) LIn(key, object);
-  return MarkAsCall(DefineFixed(result, x0), instr);
-}
-
-
 LInstruction* LChunkBuilder::DoInductionVariableAnnotation(
     HInductionVariableAnnotation* instr) {
   return NULL;