PPC: perf enhancement: Use larger heap page size on PPC.

test/cctest/test-strings.cc

Index: test/cctest/test-strings.cc
diff --git a/test/cctest/test-strings.cc b/test/cctest/test-strings.cc
index d8d7c96871a8c63005343844bab68ce608429cb5..bf3177d3e824b48b3a263e20d4b160d6fa77012e 100644
--- a/test/cctest/test-strings.cc
+++ b/test/cctest/test-strings.cc
@@ -1209,8 +1209,8 @@ TEST(SliceFromSlice) {
 UNINITIALIZED_TEST(OneByteArrayJoin) {
   v8::Isolate::CreateParams create_params;
   // Set heap limits.
-  create_params.constraints.set_max_semi_space_size(1);
-  create_params.constraints.set_max_old_space_size(6);
+  create_params.constraints.set_max_semi_space_size(1 * Page::kPageSize / MB);
+  create_params.constraints.set_max_old_space_size(6 * Page::kPageSize / MB);
   create_params.array_buffer_allocator = CcTest::array_buffer_allocator();
   v8::Isolate* isolate = v8::Isolate::New(create_params);
   isolate->Enter();