Add test

Author: Hugh Delaney

llvm/test/Analysis/GlobalsModRef/amdgpu-atomic-xor-add-global.ll

@@ -0,0 +1,15 @@
+; RUN: sed -e s/.T1://g %s | opt -mtriple=amdgcn-amd-amdhsa -passes=amdgpu-add-global-for-atomic-xor -S | FileCheck %s --check-prefix=CHECK1
+; RUN: sed -e s/.T2://g %s | opt -mtriple=amdgcn-amd-amdhsa -passes=amdgpu-add-global-for-atomic-xor -S | FileCheck %s --check-prefix=CHECK2
+
+;T1: define i32 @test(ptr %p) {
+;T1: ; CHECK1:      @HipAtomicXorModuleNeedsPrefetch
+;T1:   %1 = atomicrmw volatile xor ptr %p, i32 1 syncscope("agent-one-as") monotonic, align 4
+;T1:   ret i32 %1
+;T1: }
+
+;T2: define i32 @test(ptr %p) {
+;T2: ; CHECK2-NOT:  @HipAtomicXorModuleNeedsPrefetch
+;T2:   %1 = atomicrmw volatile add ptr %p, i32 1 syncscope("agent-one-as") monotonic, align 4
+;T2:   ret i32 %1
+;T2: }
+