Avoid a call to __nacl_tls_tdb_start inside nc_release_tls_node
Avoid a call to __nacl_tls_tdb_start inside nc_release_tls_node

This limits the knowledge about the combined area to just pthread_create().

Also added a change which avoids a zero dereference in case
the malloc for new_basic_data in pthread_create fails.


BUG= None
TEST= trybots
Review URL: https://chromiumcodereview.appspot.com/10377072

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@8560 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client