[turbofan] Ensure AstGraphBuilder::CheckOsrEntry hits once.

src/compiler/ast-graph-builder.cc

Index: src/compiler/ast-graph-builder.cc
diff --git a/src/compiler/ast-graph-builder.cc b/src/compiler/ast-graph-builder.cc
index a31e9d73ad547a30a59784fc8d6831d8087bd881..68cf58905f87e1f62e0d2186409657ba29861d39 100644
--- a/src/compiler/ast-graph-builder.cc
+++ b/src/compiler/ast-graph-builder.cc
@@ -3988,8 +3988,8 @@ Node* AstGraphBuilder::TryFastToName(Node* input) {
 
 bool AstGraphBuilder::CheckOsrEntry(IterationStatement* stmt) {
   if (info()->osr_ast_id() == stmt->OsrEntryId()) {
-    info()->set_osr_expr_stack_height(std::max(
-        environment()->stack_height(), info()->osr_expr_stack_height()));
+    DCHECK_EQ(-1, info()->osr_expr_stack_height());
+    info()->set_osr_expr_stack_height(environment()->stack_height());
     return true;
   }
   return false;