ARM: Add support for segmented stacks

Patch by Alex Crichton, ILyoan, Luqman Aden and Svetoslav.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205430 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/ARM/ARMISelLowering.cpp

@@ -3101,6 +3101,8 @@ ARMTargetLowering::LowerFormalArguments(SDValue Chain,
                          CCInfo.getNextStackOffset(),
                          TotalArgRegsSaveSize);
 
+  AFI->setArgumentStackSize(CCInfo.getNextStackOffset());
+
   return Chain;
 }