Revert "runtime: allow over-aligned types in the runtime"

[grynspan]

swift::aligned_alloc (and friends) was added as a workaround for 32-bit platforms' operator new under-aligning allocations, but this was later corrected more cleanly by including <new> for placement new and by using swift_cxx_newObject() to rely on swift_slowAlloc() for allocations instead of operator new. The commit that added swift::aligned_alloc can be removed now.

This change reverts commit b694ce4.

Resolves #58498.

[grynspan]

@swift-ci please test

[compnerd]

Seems reasonable to me however, the commit message could use a bit of tweaking - it was a fix for non-alignment aware operator new (on <C++17) for non-Darwin 32-bit platforms, not specifically Windows.

[grynspan]

Seems reasonable to me however, the commit message could use a bit of tweaking - it was a fix for non-alignment aware operator new (on <C++17) for non-Darwin 32-bit platforms, not specifically Windows.

FWIW the commit message is just:

Revert "runtime: allow over-aligned types in the runtime"

But I'll amend the PR description to clarify.

[grynspan]

Just need to fix up Heap.h, then I can merge.

[grynspan]

@swift-ci please smoke test