[turbofan] Ensure AstGraphBuilder::CheckOsrEntry hits once.

src/compilation-info.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compilation-info.h"
 
 #include "src/api.h"
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
 #include "src/isolate.h"
@@ skipping 61 matching lines @@
       osr_ast_id_(BailoutId::None()),
       zone_(zone),
       deferred_handles_(nullptr),
       dependencies_(isolate, zone),
       bailout_reason_(kNoReason),
       prologue_offset_(Code::kPrologueOffsetNotSet),
       track_positions_(FLAG_hydrogen_track_positions ||
                        isolate->is_profiling()),
       parameter_count_(0),
       optimization_id_(-1),
-      osr_expr_stack_height_(0),
+      osr_expr_stack_height_(-1),
       debug_name_(debug_name) {}
 
 CompilationInfo::~CompilationInfo() {
   if (GetFlag(kDisableFutureOptimization) && has_shared_info()) {
     shared_info()->DisableOptimization(bailout_reason());
   }
   dependencies()->Rollback();
   delete deferred_handles_;
 }
 
@@ skipping 114 matching lines @@
   inlined_functions_.push_back(InlinedFunctionHolder(
       inlined_function, handle(inlined_function->code())));
 }
 
 Code::Kind CompilationInfo::output_code_kind() const {
   return Code::ExtractKindFromFlags(code_flags_);
 }
 
 }  // namespace internal
 }  // namespace v8