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TableGen: Add !dag function for construction

Description

TableGen: Add !dag function for construction

This allows constructing DAG nodes with programmatically determined
names, and can simplify constructing DAG nodes in other cases as
well.

Also, add documentation and some very simple tests for the already
existing !con.

Change-Id: Ida61cd82e99752548d7109ce8da34d29da56a5f7

Differential revision: https://reviews.llvm.org/D44110

Details

Committed
nhaMar 14 2018, 4:00 AM
Differential Revision
D44110: TableGen: Add !dag function for construction
Parents
rL327491: StaticAnalyzer: fix compiler warning. NFC
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