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[DDG] Data Dependence Graph - DOT printer - recommit

Authored by bmahjour on Dec 16 2020, 9:34 AM.

Description

[DDG] Data Dependence Graph - DOT printer - recommit

This is being recommitted to try and address the MSVC complaint.

This patch implements a DDG printer pass that generates a graph in
the DOT description language, providing a more visually appealing
representation of the DDG. Similar to the CFG DOT printer, this
functionality is provided under an option called -dot-ddg and can
be generated in a less verbose mode under -dot-ddg-only option.

Reviewed By: Meinersbur

Differential Revision: https://reviews.llvm.org/D90159

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