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

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

Index: src/compiler/mips/code-generator-mips.cc
diff --git a/src/compiler/mips/code-generator-mips.cc b/src/compiler/mips/code-generator-mips.cc
index 66ffb6f898f0e718efbbd22b8c8f3543bca6d6f4..e2ae0bd05dca5f063483f5c5dc3fb224b9263722 100644
--- a/src/compiler/mips/code-generator-mips.cc
+++ b/src/compiler/mips/code-generator-mips.cc
@@ -1152,11 +1152,7 @@ void CodeGenerator::AssembleReturn() {
       __ bind(&return_label_);
       __ mov(sp, fp);
       __ Pop(ra, fp);
-      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) {
         __ DropAndRet(pop_count);
       } else {