[turbofan] Remove --turbo-loop-stackcheck flag.

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 8c5dce61eea424a526fb3902666b2a0ad20f91fa..fd8a56aa21a23bc9bc017bcc7688c8392c7b658d 100644
--- a/src/compiler/ast-graph-builder.cc
+++ b/src/compiler/ast-graph-builder.cc
@@ -2228,10 +2228,8 @@ void AstGraphBuilder::VisitIterationBody(IterationStatement* stmt,
                                          LoopBuilder* loop,
                                          BailoutId stack_check_id) {
   ControlScopeForIteration scope(this, stmt, loop);
-  if (FLAG_turbo_loop_stackcheck || !info()->shared_info()->asm_function()) {
-    Node* node = NewNode(javascript()->StackCheck());
-    PrepareFrameState(node, stack_check_id);
-  }
+  Node* node = NewNode(javascript()->StackCheck());
+  PrepareFrameState(node, stack_check_id);
   Visit(stmt->body());
 }