[PATCH] [libcxx] Cleanup <atomic> and cleanup support for C++03.

[Eric Fiselier]

Remove unused implementation of `__c11_is_atomic_lock_free` for GCC.


http://reviews.llvm.org/D10046

Files:
  include/__config
  include/atomic
  include/ios
  include/memory
  src/ios.cpp
  src/memory.cpp
  test/libcxx/atomics/init_macros.pass.cpp
  test/libcxx/atomics/libcpp-has-no-threads.fail.cpp
  test/libcxx/atomics/libcpp-has-no-threads.pass.cpp
  test/libcxx/atomics/version.pass.cpp
  test/std/atomics/atomics.flag/atomic_flag_clear.pass.cpp
  test/std/atomics/atomics.flag/atomic_flag_clear_explicit.pass.cpp
  test/std/atomics/atomics.flag/clear.pass.cpp
  test/std/atomics/atomics.flag/init.pass.cpp
  test/std/atomics/atomics.types.generic/trivially_copyable.fail.cpp
  test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_strong.pass.cpp
  test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_strong_explicit.pass.cpp
  test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_weak.pass.cpp
  test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_compare_exchange_weak_explicit.pass.cpp
  test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_exchange.pass.cpp
  test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_exchange_explicit.pass.cpp
  test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_add.pass.cpp
  test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_add_explicit.pass.cpp
  test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_sub.pass.cpp
  test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_fetch_sub_explicit.pass.cpp
  test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_init.pass.cpp
  test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_load.pass.cpp
  test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_load_explicit.pass.cpp
  test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_store.pass.cpp
  test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_store_explicit.pass.cpp
  test/std/atomics/atomics.types.operations/atomics.types.operations.req/atomic_var_init.pass.cpp
  test/std/atomics/libcpp-has-no-threads.fail.cpp
  test/std/atomics/libcpp-has-no-threads.pass.cpp
  test/std/atomics/version.pass.cpp
  test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_compare_exchange_strong.pass.cpp
  test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_compare_exchange_strong_explicit.pass.cpp
  test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_compare_exchange_weak.pass.cpp
  test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_compare_exchange_weak_explicit.pass.cpp
  test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_exchange.pass.cpp
  test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_exchange_explicit.pass.cpp
  test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_is_lock_free.pass.cpp
  test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_load.pass.cpp
  test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_load_explicit.pass.cpp
  test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_store.pass.cpp
  test/std/utilities/memory/util.smartptr/util.smartptr.shared.atomic/atomic_store_explicit.pass.cpp

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