PTX: Fix some lingering issues with stack allocation

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140535 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/PTX/stack-object.ll

@@ -0,0 +1,10 @@
+; RUN: llc < %s -march=ptx32 -mattr=sm20 | FileCheck %s
+
+define ptx_device float @stack1(float %a) {
+  ; CHECK: .local .b32 __local0;
+  %a.2 = alloca float
+  ; CHECK: st.local.f32 [__local0], %f0
+  store float %a, float* %a.2
+  %a.3 = load float* %a.2
+  ret float %a.3
+}