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Fix passing/returning structs with the 64-bit SPARC ABI Fixes the 64-bit SPARC part of rust-lang/rust#115609 by replacing the current implementation with a new implementation modelled on the RISC-V calling convention code ([SPARC ABI reference](https://sparc.org/wp-content/uploads/2014/01/SCD.2.4.1.pdf.gz)). Pinging `sparcv9-sun-solaris` target maintainers: @psumbera @kulikjak Fixes rust-lang/rust#115336 Fixes rust-lang/rust#115399 Fixes rust-lang/rust#122620 Fixes https://github.com/rust-lang/rust/issues/147883 r? @workingjubilee
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