[compiler-rt] Relax pthread_getaffinity test to account for cgroups/docker

Fixes #58283

When running in a docker container you can have fewer cores assigned
to you than get_nrpoc would suggest.

Since the test just wants to know that interception worked, allow
any result > 0 and <= the global core count.

Reviewed By: MaskRay, vitalybuka

Differential Revision: https://reviews.llvm.org/D135677

compiler-rt/test/sanitizer_common/TestCases/Linux/pthread_getaffinity_np.cpp

@@ -16,7 +16,8 @@ int main() {
   pthread_t tid = pthread_self();
   int res = pthread_getaffinity_np(tid, sizeof(set_x), set_x);
   assert(res == 0);
-  assert(CPU_COUNT_S(sizeof(set_x), set_x) == get_nprocs());
+  int cpus = CPU_COUNT_S(sizeof(set_x), set_x);
+  assert(cpus > 0 && cpus <= get_nprocs());
 
   return 0;
 }