Fix has_constant_parameter_count() confusion in LReturn

src/arm64/lithium-codegen-arm64.cc

 // Copyright 2013 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/v8.h"
 
 #include "src/arm64/lithium-codegen-arm64.h"
 #include "src/arm64/lithium-gap-resolver-arm64.h"
 #include "src/base/bits.h"
 #include "src/code-factory.h"
@@ skipping 4748 matching lines @@
     Register stack_pointer = masm()->StackPointer();
     __ Mov(stack_pointer, fp);
     no_frame_start = masm_->pc_offset();
     __ Pop(fp, lr);
   }
 
   if (instr->has_constant_parameter_count()) {
     int parameter_count = ToInteger32(instr->constant_parameter_count());
     __ Drop(parameter_count + 1);
   } else {
+    DCHECK(info()->IsStub());  // Functions would need to drop one more value.
     Register parameter_count = ToRegister(instr->parameter_count());
     __ DropBySMI(parameter_count);
   }
   __ Ret();
 
   if (no_frame_start != -1) {
     info_->AddNoFrameRange(no_frame_start, masm_->pc_offset());
   }
 }
 
@@ skipping 1257 matching lines @@
   Handle<ScopeInfo> scope_info = instr->scope_info();
   __ Push(scope_info);
   __ Push(ToRegister(instr->function()));
   CallRuntime(Runtime::kPushBlockContext, 2, instr);
   RecordSafepoint(Safepoint::kNoLazyDeopt);
 }
 
 
 
 } }  // namespace v8::internal