[AMDGPU] Ensure return address is save/restored around the call with IPRA enabled/disabled

[RamNalamothu]

This test will be used to verify the fix that will be added to https://reviews.llvm.org/D114652 for resolving the OpenMP LIT failures.

llvm/test/CodeGen/AMDGPU/ipra.ll

 ; GCN-NOT: s5
 ; GCN-NOT: s32
 define void @test_funcx2() #0 {
   call void @void_func_void()
   call void @void_func_void()
   ret void
 }
 
+define weak amdgpu_kernel void @wombat(i32* %arg, i32* %arg2) {
+bb:
+  call void @hoge() #0
+  ret void
+}
+
+; Make sure we save/restore the return address around the call.
+; Function Attrs: norecurse
+define internal void @hoge() #2 {
+bb:
+; GCN-LABEL: {{^}}hoge:
+; GCN-DAG: v_writelane_b32 [[CSR_VGPR:v[0-9]+]], s30,
+; GCN-DAG: v_writelane_b32 [[CSR_VGPR]], s31,
+; GCN: s_swappc_b64 s[30:31]
+; GCN-DAG: v_readlane_b32 s4, [[CSR_VGPR]],
+; GCN-DAG: v_readlane_b32 s5, [[CSR_VGPR]],
+; GCN: s_waitcnt vmcnt(0)
+; GCN: s_setpc_b64 s[4:5]
+  call void @eggs()
+  ret void
+}
+
+declare dso_local void @eggs()
+
+
 attributes #0 = { nounwind }
 attributes #1 = { nounwind noinline "amdgpu-no-workitem-id-x" "amdgpu-no-workitem-id-y" "amdgpu-no-workitem-id-z" }
+attributes #2 = { norecurse }