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[mlir][linalg] Only generate one var for an attrUse.

Authored by hanchung on Mar 2 2021, 12:48 PM.

Description

[mlir][linalg] Only generate one var for an attrUse.

Some variables are unused after D97383 landed. We should generate one symbol for one attrUse.

Reviewed By: stellaraccident

Differential Revision: https://reviews.llvm.org/D97794