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ad0f5f6b52
Change the syntax to use `%0.sub8` to denote a subregister. This seems like a more natural fit to denote subregisters; I also plan to introduce a new ":classname" syntax in upcoming patches to denote the register class of a vreg. Note that this commit disallows plain identifiers to start with a '.' character. This shouldn't affect anything as external names/IR references are all prefixed with '$'/'%', plain identifiers are only used for instruction names, register mask names and subreg indexes. Differential Revision: https://reviews.llvm.org/D22390 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@276815 91177308-0d34-0410-b5e6-96231b3b80d8