v3 PATCH to avoid -Wsized-deallocation warnings with C++14 compiler

[Jason Merrill]

When GCC defaults to C++14, it gives -Wsized-deallocation warnings for 
the non-sized operator deletes.  We dealt with this for the sized ones 
by passing -Wno-sized-deallocation on the command line, but using 
#pragma GCC diagnostic seems cleaner to me.

Applying to trunk.
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