[turbofan] Simplifying handling of callee-cleanup stack area.

src/compiler/x64/code-generator-x64.cc

Index: src/compiler/x64/code-generator-x64.cc
diff --git a/src/compiler/x64/code-generator-x64.cc b/src/compiler/x64/code-generator-x64.cc
index 56477d66b66c9baa0d527da7ed3554d1d69f4e0a..38c7f2a31c90724b3fd39767c07b3801fde1cbc6 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -1569,11 +1569,7 @@ void CodeGenerator::AssembleReturn() {
       __ bind(&return_label_);
       __ movq(rsp, rbp);  // Move stack pointer back to frame pointer.
       __ popq(rbp);       // Pop caller's frame pointer.
-      int pop_count = descriptor->IsJSFunctionCall()
-                          ? static_cast<int>(descriptor->JSParameterCount())
-                          : (info()->IsStub()
-                                 ? info()->code_stub()->GetStackParameterCount()
-                                 : 0);
+      int pop_count = static_cast<int>(descriptor->StackParameterCount());
       if (pop_count == 0) {
         __ Ret();
       } else {