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Chris Lattner aaa2982d71 [MLIR Core] Cache the empty StringAttr like we do for empty dictionaries. NFC. 
MLIRContext holds a few special case values that occur frequently like empty
dictionary and NoneType, which allow us to avoid taking locks to get an instance
of them.  Give the empty StringAttr this treatment as well.  This cuts several
percent off compile time for CIRCT.

Differential Revision: https://reviews.llvm.org/D103117
 		2021-05-25 14:58:17 -07:00
..
mlir [MLIR Core] Cache the empty StringAttr like we do for empty dictionaries. NFC. 2021-05-25 14:58:17 -07:00
mlir-c Surface clone APIs in CAPI 2021-05-24 11:53:00 -07:00