fix misaligned placement-new storages in runtime - #1691
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Static char storages used as backing memory for placement new of array<T> had alignment 1, which is UB when the linker places them at an address not aligned to alignof(array<T>). UBSan (clang-18) reports "constructor call on misaligned address" at startup of every runtime unit test. Add alignas() to all such storages. Co-Authored-By: Claude Code <noreply@anthropic.com>
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small fix
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Static char storages used as backing memory for placement new of array had alignment 1, which is UB when the linker places them at an address not aligned to alignof(array). Add alignas() to all such storages.