Revert "Merge old data and pointer space."

src/arm64/lithium-codegen-arm64.cc

Index: src/arm64/lithium-codegen-arm64.cc
diff --git a/src/arm64/lithium-codegen-arm64.cc b/src/arm64/lithium-codegen-arm64.cc
index 98732683989d2906775a25e389566108b8291803..3f7644962907b33b4a1f341b146e9cad3398e932 100644
--- a/src/arm64/lithium-codegen-arm64.cc
+++ b/src/arm64/lithium-codegen-arm64.cc
@@ -1580,9 +1580,13 @@ void LCodeGen::DoAllocate(LAllocate* instr) {
     flags = static_cast<AllocationFlags>(flags | DOUBLE_ALIGNMENT);
   }
 
-  if (instr->hydrogen()->IsOldSpaceAllocation()) {
+  if (instr->hydrogen()->IsOldPointerSpaceAllocation()) {
+    DCHECK(!instr->hydrogen()->IsOldDataSpaceAllocation());
     DCHECK(!instr->hydrogen()->IsNewSpaceAllocation());
-    flags = static_cast<AllocationFlags>(flags | PRETENURE);
+    flags = static_cast<AllocationFlags>(flags | PRETENURE_OLD_POINTER_SPACE);
+  } else if (instr->hydrogen()->IsOldDataSpaceAllocation()) {
+    DCHECK(!instr->hydrogen()->IsNewSpaceAllocation());
+    flags = static_cast<AllocationFlags>(flags | PRETENURE_OLD_DATA_SPACE);
   }
 
   if (instr->size()->IsConstantOperand()) {
@@ -1637,9 +1641,13 @@ void LCodeGen::DoDeferredAllocate(LAllocate* instr) {
   }
   int flags = AllocateDoubleAlignFlag::encode(
       instr->hydrogen()->MustAllocateDoubleAligned());
-  if (instr->hydrogen()->IsOldSpaceAllocation()) {
+  if (instr->hydrogen()->IsOldPointerSpaceAllocation()) {
+    DCHECK(!instr->hydrogen()->IsOldDataSpaceAllocation());
+    DCHECK(!instr->hydrogen()->IsNewSpaceAllocation());
+    flags = AllocateTargetSpace::update(flags, OLD_POINTER_SPACE);
+  } else if (instr->hydrogen()->IsOldDataSpaceAllocation()) {
     DCHECK(!instr->hydrogen()->IsNewSpaceAllocation());
-    flags = AllocateTargetSpace::update(flags, OLD_SPACE);
+    flags = AllocateTargetSpace::update(flags, OLD_DATA_SPACE);
   } else {
     flags = AllocateTargetSpace::update(flags, NEW_SPACE);
   }