S390: Change printf format specifier for size_t in heap.cc and spaces.cc

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 23f3531f16dd2e5ef8fd745c22410fe131e295a8..4c09a5a045480dbb49f13566da38609b2931f001 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -4558,7 +4558,7 @@ void Heap::ReportHeapStatistics(const char* title) {
   USE(title);
   PrintF(">>>>>> =============== %s (%d) =============== >>>>>>\n", title,
          gc_count_);
-  PrintF("old_generation_allocation_limit_ %" V8PRIdPTR "\n",
+  PrintF("old_generation_allocation_limit_ %" PRIuS "\n",
          old_generation_allocation_limit_);
 
   PrintF("\n");