Improve the casing of Stackmap and Stacktrace.

runtime/vm/object_store.h

Index: runtime/vm/object_store.h
diff --git a/runtime/vm/object_store.h b/runtime/vm/object_store.h
index 8be015efebc0e33998ee9556ebd5526cbfb14c3c..f3aabe635a40eb16e5999ebc5348a5f27b18a3c6 100644
--- a/runtime/vm/object_store.h
+++ b/runtime/vm/object_store.h
@@ -361,10 +361,10 @@ class ObjectStore {
     preallocated_unhandled_exception_ = value.raw();
   }
 
-  RawStacktrace* preallocated_stack_trace() const {
+  RawStackTrace* preallocated_stack_trace() const {
     return preallocated_stack_trace_;
   }
-  void set_preallocated_stack_trace(const Stacktrace& value) {
+  void set_preallocated_stack_trace(const StackTrace& value) {
     preallocated_stack_trace_ = value.raw();
   }
 
@@ -533,7 +533,7 @@ class ObjectStore {
   V(RawInstance*, stack_overflow_)                                             \
   V(RawInstance*, out_of_memory_)                                              \
   V(RawUnhandledException*, preallocated_unhandled_exception_)                 \
-  V(RawStacktrace*, preallocated_stack_trace_)                                 \
+  V(RawStackTrace*, preallocated_stack_trace_)                                 \
   V(RawFunction*, lookup_port_handler_)                                        \
   V(RawTypedData*, empty_uint32_array_)                                        \
   V(RawFunction*, handle_message_function_)                                    \