Reland "Merge old data and pointer space."

src/ppc/macro-assembler-ppc.h

Index: src/ppc/macro-assembler-ppc.h
diff --git a/src/ppc/macro-assembler-ppc.h b/src/ppc/macro-assembler-ppc.h
index 04e9bd85bdaa7623010d45df7fa16c02940fd96c..2e415d6b6b548206888eed313a8a9ffe399047a5 100644
--- a/src/ppc/macro-assembler-ppc.h
+++ b/src/ppc/macro-assembler-ppc.h
@@ -603,7 +603,7 @@ class MacroAssembler : public Assembler {
   // ---------------------------------------------------------------------------
   // Allocation support
 
-  // Allocate an object in new space or old pointer space. The object_size is
+  // Allocate an object in new space or old space. The object_size is
   // specified either in bytes or in words if the allocation flag SIZE_IN_WORDS
   // is passed. If the space is exhausted control continues at the gc_required
   // label. The allocated object is returned in result. If the flag