[heap] Fix RuntimeCallTimerScope usages

src/heap/spaces.cc

Index: src/heap/spaces.cc
diff --git a/src/heap/spaces.cc b/src/heap/spaces.cc
index 47e8e672ede7a9d72f26c4d7958ef1d5d3821997..afbb452f54527878fe55a8b4034344f51b535627 100644
--- a/src/heap/spaces.cc
+++ b/src/heap/spaces.cc
@@ -2937,8 +2937,8 @@ HeapObject* CompactionSpace::SweepAndRetryAllocation(int size_in_bytes) {
 
 HeapObject* PagedSpace::SlowAllocateRaw(int size_in_bytes) {
   VMState<GC> state(heap()->isolate());
-  RuntimeCallTimerScope(heap()->isolate(),
-                        &RuntimeCallStats::GC_SlowAllocateRaw);
+  RuntimeCallTimerScope runtime_timer(heap()->isolate(),
+                                      &RuntimeCallStats::GC_SlowAllocateRaw);
   return RawSlowAllocateRaw(size_in_bytes);
 }