Update Assembler::TryAllocate to support inline allocation tracing

runtime/vm/class_table.cc

Index: runtime/vm/class_table.cc
diff --git a/runtime/vm/class_table.cc b/runtime/vm/class_table.cc
index 8ec699b6bf21f4ca2f3d77bbc26ba122eeb4f344..1966b217ebcc47956415dada5beeda4f73203738 100644
--- a/runtime/vm/class_table.cc
+++ b/runtime/vm/class_table.cc
@@ -82,6 +82,12 @@ void ClassTable::FreeOldTables() {
 }
 
 
+void ClassTable::TraceAllocationsFor(intptr_t cid, bool trace) {
+  ClassHeapStats* stats = PreliminaryStatsAt(cid);
+  stats->set_trace_allocation(trace);
+}
+
+
 void ClassTable::Register(const Class& cls) {
   intptr_t index = cls.id();
   if (index != kIllegalCid) {
@@ -233,6 +239,7 @@ void ClassHeapStats::Initialize() {
   last_reset.Reset();
   promoted_count = 0;
   promoted_size = 0;
+  state_ = 0;
 }