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Reland: Introduce -dot-cfg-mssa option which creates dot-cfg style file with…

Authored by jamieschmeiser on Nov 12 2020, 9:39 AM.

Description

Reland: Introduce -dot-cfg-mssa option which creates dot-cfg style file with mssa comments included in source

Summary:
Expand the print-memoryssa and print<memoryssa> passes with a new hidden
option -cfg-dot-mssa that names a file. When set, a dot-cfg style file
will be generated into the named file with the memoryssa comments retained
and those blocks containing them shown in light pink. The option does
nothing in isolation.

Author: Jamie Schmeiser <schmeise@ca.ibm.com>

Reviewed By: asbirlea (Alina Sbirlea), dblaikie (David Blaikie)

Differential Revision: https://reviews.llvm.org/D90638