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

src/compiler/arm64/code-generator-arm64.cc

Index: src/compiler/arm64/code-generator-arm64.cc
diff --git a/src/compiler/arm64/code-generator-arm64.cc b/src/compiler/arm64/code-generator-arm64.cc
index c3e9af6a29e7e6be9931bf1872eebdd96290aa75..58adc2509883c6c5fcd002d1871c680136fae345 100644
--- a/src/compiler/arm64/code-generator-arm64.cc
+++ b/src/compiler/arm64/code-generator-arm64.cc
@@ -1178,11 +1178,7 @@ void CodeGenerator::AssembleReturn() {
       __ Bind(&return_label_);
       __ Mov(jssp, fp);
       __ Pop(fp, lr);
-      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) {
         __ Drop(pop_count);
       }