Fix has_constant_parameter_count() confusion in LReturn

src/arm/lithium-codegen-arm.cc

 // Copyright 2012 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/arm/lithium-codegen-arm.h"
 #include "src/arm/lithium-gap-resolver-arm.h"
 #include "src/base/bits.h"
 #include "src/code-factory.h"
@@ skipping 2946 matching lines @@
     no_frame_start = masm_->LeaveFrame(StackFrame::JAVA_SCRIPT);
   }
   { ConstantPoolUnavailableScope constant_pool_unavailable(masm());
     if (instr->has_constant_parameter_count()) {
       int parameter_count = ToInteger32(instr->constant_parameter_count());
       int32_t sp_delta = (parameter_count + 1) * kPointerSize;
       if (sp_delta != 0) {
         __ add(sp, sp, Operand(sp_delta));
       }
     } else {
+      DCHECK(info()->IsStub());  // Functions would need to drop one more value.
       Register reg = ToRegister(instr->parameter_count());
       // The argument count parameter is a smi
       __ SmiUntag(reg);
       __ add(sp, sp, Operand(reg, LSL, kPointerSizeLog2));
     }
 
     __ Jump(lr);
 
     if (no_frame_start != -1) {
       info_->AddNoFrameRange(no_frame_start, masm_->pc_offset());
@@ skipping 2928 matching lines @@
   __ Push(scope_info);
   __ push(ToRegister(instr->function()));
   CallRuntime(Runtime::kPushBlockContext, 2, instr);
   RecordSafepoint(Safepoint::kNoLazyDeopt);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal