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[NFC] Refactor TableGen for attributes
Summary:
this patch makes tablegen generate llvm attributes in a more generic and simpler (at least to me).
changes: make tablegen generate
...
ATTRIBUTE_ENUM(Alignment,align)
ATTRIBUTE_ENUM(AllocSize,allocsize)
...
which can be used to generate most of what was previously used and more.
Tablegen was also generating attributes from 2 identical files leading to identical output. so I removed one of them and made user use the other.
Reviewers: jdoerfert, thakis, aaron.ballman
Reviewed By: aaron.ballman
Subscribers: mgorny, hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D72455