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Implement target_clones multiversioning
As discussed here: https://lwn.net/Articles/691932/ GCC6.0 adds target_clones multiversioning. This functionality is an odd cross between the cpu_dispatch and 'target' MV, but is compatible with neither. This attribute allows you to list all options, then emits a separately optimized version of each function per-option (similar to the cpu_specific attribute). It automatically generates a resolver, just like the other two. The mangling however, is... ODD to say the least. The mangling format is: <normal_mangling>.<option string>.<option ordinal>. Differential Revision:https://reviews.llvm.org/D51650
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Erich Keane
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Nov 11, 2021
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