[PATCH] Diagnose const destination to __atomic_load

[Jonathan Roelofs]

It probably makes sense to extend this to all of the related builtins that can write to their pointer argument:

  __atomic_store
  __atomic_store_n
  __atomic_exchange
  __atomic_exchange
  __atomic_compare_exchange
  __atomic_compare_exchange_n
  __atomic_test_and_set
  __atomic_clear


http://reviews.llvm.org/D10407

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