[Offload] XFAIL pgo tests until resolved (#163722)

While people look into it, xfail the tests.

Author: jplehr

offload/test/offloading/gpupgo/pgo_atomic_teams.c

@@ -18,6 +18,7 @@
 
 // REQUIRES: amdgpu
 // REQUIRES: pgo
+// XFAIL: amdgpu
 
 int test1(int a) { return a / 2; }
 int test2(int a) { return a * 2; }

offload/test/offloading/gpupgo/pgo_atomic_threads.c

@@ -18,6 +18,7 @@
 
 // REQUIRES: amdgpu
 // REQUIRES: pgo
+// XFAIL: amdgpu
 
 int test1(int a) { return a / 2; }
 

offload/test/offloading/gpupgo/pgo_device_and_host.c

@@ -50,6 +50,7 @@
 
 // REQUIRES: amdgpu
 // REQUIRES: pgo
+// XFAIL: amdgpu
 
 int main() {
   int host_var = 0;

offload/test/offloading/gpupgo/pgo_device_only.c

@@ -16,6 +16,7 @@
 
 // REQUIRES: amdgpu
 // REQUIRES: pgo
+// XFAIL: amdgpu
 
 int test1(int a) { return a / 2; }
 int test2(int a) { return a * 2; }