[compiler] Remove CompilationInfo::opt_count field.

src/crankshaft/hydrogen.cc

Index: src/crankshaft/hydrogen.cc
diff --git a/src/crankshaft/hydrogen.cc b/src/crankshaft/hydrogen.cc
index 38a9fd0ad88425776d69b9485ac0ea852c81d91d..e1b9ba77070fadc0e0a04cb0a9216e2b97632c34 100644
--- a/src/crankshaft/hydrogen.cc
+++ b/src/crankshaft/hydrogen.cc
@@ -3599,7 +3599,6 @@ std::ostream& operator<<(std::ostream& os, const HBasicBlock& b) {
   return os << "B" << b.block_id();
 }
 
-
 HGraph::HGraph(CompilationInfo* info, CallInterfaceDescriptor descriptor)
     : isolate_(info->isolate()),
       next_block_id_(0),
@@ -3612,6 +3611,7 @@ HGraph::HGraph(CompilationInfo* info, CallInterfaceDescriptor descriptor)
       info_(info),
       descriptor_(descriptor),
       zone_(info->zone()),
+      allow_code_motion_(false),
       use_optimistic_licm_(false),
       depends_on_empty_array_proto_elements_(false),
       type_change_checksum_(0),
@@ -4445,6 +4445,11 @@ bool HOptimizedGraphBuilder::BuildGraph() {
       !type_info->matches_inlined_type_change_checksum(composite_checksum));
   type_info->set_inlined_type_change_checksum(composite_checksum);
 
+  // Set this predicate early to avoid handle deref during graph optimization.
+  graph()->set_allow_code_motion(
+      current_info()->IsStub() ||
+      current_info()->shared_info()->opt_count() + 1 < FLAG_max_opt_count);
+
   // Perform any necessary OSR-specific cleanups or changes to the graph.
   osr()->FinishGraph();