Allow target-specific attributes to share a spelling between different...
Allow target-specific attributes to share a spelling between different attributes via the ParseKind field. Attributes will be given a common parsed attribute identifier (the AttributeList::AT_* enum), but retain distinct Attr subclasses. This new functionality is used to implement the ARM and MSP430 interrupt attribute. Patch reviewed by Richard Smith over IRC. llvm-svn: 197343
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