[turbofan] Frame elision for code stubs

src/compiler/pipeline.cc

Index: src/compiler/pipeline.cc
diff --git a/src/compiler/pipeline.cc b/src/compiler/pipeline.cc
index 50846d6e81f6c03c69fa4e2b40c33f8e0b93a96e..be16940ad17cab134299c03765e89c5665ef74b6 100644
--- a/src/compiler/pipeline.cc
+++ b/src/compiler/pipeline.cc
@@ -1002,8 +1002,9 @@ struct OptimizeMovesPhase {
 struct FrameElisionPhase {
   static const char* phase_name() { return "frame elision"; }
 
-  void Run(PipelineData* data, Zone* temp_zone) {
-    FrameElider(data->sequence()).Run();
+  void Run(PipelineData* data, Zone* temp_zone,
+           const CallDescriptor* descriptor) {
+    FrameElider(data->sequence()).Run(descriptor);
   }
 };
 
@@ -1373,11 +1374,7 @@ Handle<Code> Pipeline::ScheduleAndGenerateCode(
   BeginPhaseKind("code generation");
   // TODO(mtrofin): move this off to the register allocator.
   bool generate_frame_at_start =
-      !FLAG_turbo_frame_elision || !data_->info()->IsStub() ||
-      !data_->frame()->needs_frame() ||
-      data_->sequence()->instruction_blocks().front()->needs_frame() ||
-      linkage.GetIncomingDescriptor()->CalleeSavedFPRegisters() != 0 ||
-      linkage.GetIncomingDescriptor()->CalleeSavedRegisters() != 0;
+      data_->sequence()->instruction_blocks().front()->must_construct_frame();
   // Optimimize jumps.
   if (FLAG_turbo_jt) {
     Run<JumpThreadingPhase>(generate_frame_at_start);
@@ -1485,10 +1482,9 @@ void Pipeline::AllocateRegisters(const RegisterConfiguration* config,
   }
 
   // We plan to enable frame elision only for stubs and bytecode handlers.
-  if (FLAG_turbo_frame_elision && info()->IsStub()) {
-    Run<LocateSpillSlotsPhase>();
-    Run<FrameElisionPhase>();
-  }
+
+  Run<LocateSpillSlotsPhase>();
+  Run<FrameElisionPhase>(descriptor);
 
   Run<AssignSpillSlotsPhase>();