River Riddle ac91e67375 Add support for walking the uses of a symbol. ... MLIR uses symbol references to model references to many global entities, such as functions/variables/etc. Before this change, there is no way to actually reason about the uses of such entities. This change provides a walker for symbol references(via SymbolTable::walkSymbolUses), as well as 'use_empty' support(via SymbolTable::symbol_use_empty). It also resolves some deficiencies in the LangRef definition of SymbolRefAttr, namely the restrictions on where a SymbolRefAttr can be stored, ArrayAttr and DictionaryAttr, and the relationship with operations containing the SymbolTable trait. PiperOrigin-RevId: 273549331		2019-10-08 10:21:59 -07:00
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mlir	Add support for walking the uses of a symbol.	2019-10-08 10:21:59 -07:00
mlir-c	NFC: Rename Function to FuncOp.	2019-07-10 10:10:53 -07:00