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1aed962216
this meant to abstract the sumtype representation required to transfert `offcode` to `ZSTD_storeSeq()`. Unfortunately, the sumtype numeric representation is currently a leaky abstraction that has permeated many other parts of the code, especially within `zstd_lazy.c` and also within `zstd_opt.c` and `zstd_compress.c`. While this PR makes a good job a transfering a large nb of call sites to using the new macros, there are still a few sites where this transformation is more complex, or where the numeric representation itself it used "as is". One of the problematics area is the decision to use the numeric format of the sumtype within the match finders of `zstd_lazy`. This commit doesn't change the behavior, it only introduces and employes the macros, but eventually the resulting code remains identical. At target, if the numeric representation of the sumtype can be completely abstracted and no other part of the code depends on it, it will be possible to move it towards something slightly more efficient.