[mips] Add member field MipsFunctionInfo::IncomingArgSize which holds the size
of the incoming argument area.

llvm-svn: 167312
diff --git a/llvm/lib/Target/Mips/MipsISelLowering.cpp b/llvm/lib/Target/Mips/MipsISelLowering.cpp
index 47a4f1a..9f4d15c 100644
--- a/llvm/lib/Target/Mips/MipsISelLowering.cpp
+++ b/llvm/lib/Target/Mips/MipsISelLowering.cpp
@@ -3027,6 +3027,7 @@
   MipsCCInfo.analyzeFormalArguments(Ins);
   MipsFI->setFormalArgInfo(CCInfo.getNextStackOffset(),
                            MipsCCInfo.hasByValArg());
+  MipsFI->setIncomingArgSize(CCInfo.getNextStackOffset());
 
   Function::const_arg_iterator FuncArg =
     DAG.getMachineFunction().getFunction()->arg_begin();