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2d7add6e2e
This allows the contents of OVERLAYs to be attributed to memory regions. This is the only clean way to overlap VMAs in linker scripts that choose to primarily use memory regions to lay out addresses. This also simplifies OVERLAY expansion to better match GNU LD. Expressions for the first section's LMA and VMA are not generated if the user did not provide them. This allows the LMA/VMA offset to be preserved across multiple overlays in the same region, as with regular sections. Closes #129816