Fix truncation warnings in allocate_shared()
#4252
Merged
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Found by
std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.create/allocate_shared_for_overwrite.pass.cpp
in the upcoming libcxx update.We need to
_Convert_size
when allocating, but if that succeeds, we can simplystatic_cast
when deallocating.