replace uses of cmemory.h UAlignedMemory with C++11 alignas(type)

Description

Better/cleaner, and avoids over-allocating: https://en.cppreference.com/w/cpp/language/alignas

Look at other definitions & comments related to UAlignedMemory, e.g., U_ALIGNMENT_OFFSET(ptr).

Assignee

Andy Heninger

Reporter

Markus Scherer

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Priority

medium

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