Set shared_libasan_path in lit tests for NetBSD

Reuse the Linux code path.
diff --git a/compiler-rt/test/asan/lit.cfg b/compiler-rt/test/asan/lit.cfg
index a5e3f7b..3deb4cc 100644
--- a/compiler-rt/test/asan/lit.cfg
+++ b/compiler-rt/test/asan/lit.cfg
@@ -102,7 +102,7 @@
 config.substitutions.append( ("%clang_asan ", build_invocation(clang_asan_cflags)) )
 config.substitutions.append( ("%clangxx_asan ", build_invocation(clang_asan_cxxflags)) )
 if config.asan_dynamic:
-  if config.host_os == 'Linux':
+  if config.host_os in ['Linux', 'NetBSD']:
     shared_libasan_path = os.path.join(config.compiler_rt_libdir, "libclang_rt.asan{}.so".format(config.target_suffix))
   elif config.host_os == 'Darwin':
     shared_libasan_path = os.path.join(config.compiler_rt_libdir, 'libclang_rt.asan_{}_dynamic.dylib'.format(config.apple_platform))