R600: Fix handling of vector kernel arguments

The SelectionDAGBuilder was promoting vector kernel arguments to legal
types, but this won't work for R600 and SI since kernel arguments are
stored in memory and can't be promoted.  In order to handle vector
arguments correctly we need to look at the original types from the LLVM IR
function.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193215 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/R600/AMDGPUTargetMachine.cpp

@@ -59,8 +59,9 @@ AMDGPUTargetMachine::AMDGPUTargetMachine(const Target &T, StringRef TT,
   LLVMTargetMachine(T, TT, CPU, FS, Options, RM, CM, OptLevel),
   Subtarget(TT, CPU, FS),
   Layout(Subtarget.getDataLayout()),
-  FrameLowering(TargetFrameLowering::StackGrowsUp, 16 // Stack Alignment
-                                                 , 0),
+  FrameLowering(TargetFrameLowering::StackGrowsUp,
+                64 * 16 // Maximum stack alignment (long16)
+               , 0),
   IntrinsicInfo(this),
   InstrItins(&Subtarget.getInstrItineraryData()) {
   // TLInfo uses InstrInfo so it must be initialized after.