PPC: Remove usages of Heap::NewSpaceStart and its external reference

src/ppc/codegen-ppc.cc

Index: src/ppc/codegen-ppc.cc
diff --git a/src/ppc/codegen-ppc.cc b/src/ppc/codegen-ppc.cc
index cef8fd93034e947a28e3da6e429aa93bba47414c..5642e91f9d8244e2d142563caa945bbfb76472bc 100644
--- a/src/ppc/codegen-ppc.cc
+++ b/src/ppc/codegen-ppc.cc
@@ -136,7 +136,7 @@ void ElementsTransitionGenerator::GenerateMapChangeElementsTransition(
 
   if (mode == TRACK_ALLOCATION_SITE) {
     DCHECK(allocation_memento_found != NULL);
-    __ JumpIfJSArrayHasAllocationMemento(receiver, scratch_elements,
+    __ JumpIfJSArrayHasAllocationMemento(receiver, scratch_elements, r11,
                                          allocation_memento_found);
   }
 
@@ -169,7 +169,7 @@ void ElementsTransitionGenerator::GenerateSmiToDouble(
                      scratch2));
 
   if (mode == TRACK_ALLOCATION_SITE) {
-    __ JumpIfJSArrayHasAllocationMemento(receiver, elements, fail);
+    __ JumpIfJSArrayHasAllocationMemento(receiver, elements, scratch3, fail);
   }
 
   // Check for empty arrays, which only require a map transition and no changes
@@ -289,7 +289,7 @@ void ElementsTransitionGenerator::GenerateDoubleToObject(
                      scratch));
 
   if (mode == TRACK_ALLOCATION_SITE) {
-    __ JumpIfJSArrayHasAllocationMemento(receiver, elements, fail);
+    __ JumpIfJSArrayHasAllocationMemento(receiver, elements, scratch3, fail);
   }
 
   // Check for empty arrays, which only require a map transition and no changes