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580f4a9c1c
Fix the Rn register encoding for both SSAT and USAT. Update the parsing of the shift operand to correctly handle the allowed shift types and immediate ranges and issue meaningful diagnostics when an illegal value or shift type is specified. Add aliases to parse an ommitted shift operand (default value of 'lsl #0'). Add tests for diagnostics and proper encoding. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135990 91177308-0d34-0410-b5e6-96231b3b80d8
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