[mono][jit] Adding Vector128.Narrow,Widen as intrinsics on arm64. #84837
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Internally this also adds
OP_XUNOP
as a superoperation for SIMD operations that have one source and one dest register. Within that, the widening operations for use in JIT are defined. This is to facilitate the table-driven codegen in these cases. Also the preexisting solution would result in suboptimal codegen. Further standalone operations can be moved toOP_XUNOP
in the future.Relevant arm64 codegen macros are ported to their general variant and fixed if neccessary.
Contributes to #80566.