Modify sve.rs and sve2.rs

[ruanyuxin]

The sve.rs and sve2.rs have been modified to conform to the rust syntax of 9/17/2025, allowing for direct compilation.

Compilation method:
① clone https://github.com/davidtwco/rust/ first and then to the sve infrastructur branch
② Modify the content of bootstrap.toml to profile="compiler"
③ build: Run in the ~/sve-infrastructure/rust directory./ x.build --stage 1 --target aarch64-unknown-linux-gnu
④ Compilation Command

Can put the sve.rs and sve2.rs in "~ / sve-infrastructure/rust/tests/codegen-llvm/scalable-vectors/test/sve/" directory. Then run the following command in the "~/sve-infrastructure/rust" directory:

./build/x86_64-unknown-linux-gnu/stage1/bin/rustc
--target=aarch64-unknown-linux-gnu
-C target-feature=+sve,+sve2
--crate-type=lib
--sysroot=./build/x86_64-unknown-linux-gnu/stage1
--out-dir=tests/codegen-llvm/scalable-vectors
--emit=llvm-ir
-A warnings
tests/codegen-llvm/scalable-vectors/test/sve/sve.rs