Computes per-field abstract layout (offset, size, alignment, mangled name,
bitwiseCopyable, isOpaque) for structs with both Clang-imported and Swift-native fields.
This API will be used from the library-side to serialize layout information to binary modules.
function that queries Clang's ASTRecordLayout to extract size, alignment,
stride, bitwiseCopyable, and isOpaque for C-backed nominal types.
This also adds a -dump-abstract-layout frontend debugging flag that prints
layout info for Clang-backed stored property types in the primary source
file.
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