This patch adds aarch64 backend support for SelectFromTwoVector operation. Support for this operation in the mid-end was added in this commit - https://github.com/openjdk/jdk/commit/709914fc92dd180c8f081ff70ef476554a04f4ce#diff-6baf1c0f206351ffa49f52c8576868f82da352c2c0a61ee97849064b5400c100
            
- causes
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                    JDK-8369456 [TESTBUG] Fix the test failure of TestSelectFromTwoVectorOp.java on sve2 platforms -           
- Open
 
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- relates to
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                    JDK-8338023 Support two vector selectFrom API -           
- Closed
 
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- links to
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                     Commit(master)
        openjdk/jdk/2ba8a06f Commit(master)
        openjdk/jdk/2ba8a06f
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                     Review(master)
        openjdk/jdk/23570 Review(master)
        openjdk/jdk/23570