Try to emulate D language exception state save/restore on W64 context switch.#279

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nat-goodspeed wants to merge 11 commits intoboostorg:developfrom

nat-goodspeed:nat/exstate

Commits on Jan 1, 2025

Emulating D language fiber-specific exceptions, step 0
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Restore code to 1bde50e, with the only changes being comments.
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Add comment blocks for saving and restoring 3 ptrs at GS:[0].
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Reserve more space on the stack to save state for context switch.
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Try adjusting fiber context state data by 32 bytes, not 24.
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Revert "Try adjusting fiber context state data by 32 bytes, not 24."
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This runs like unmodified Boost.Context, with extra space reserved.
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Merge branch 'nat/exspace' into nat/exstate to fix space reservation.
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Commits on Jan 2, 2025