I have one general concern: we used to provide sized deallocation outside of 
C++14 mode via `-Xclang -fiszed-deallocation`. With this patch, that no longer 
works, because `-fsized-deallocation` doesn't cause the sized deallocation 
functions to get implicitly declared any more.

Given that the implicit declarations are not really useful unless a sized 
deallocation function is known to be available, and that it seems overkill to 
have two flags for this feature, perhaps we should keep the implicit 
declarations and the usage thereof tied together under the same flag?


http://reviews.llvm.org/D8467

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