Split out of D87120 (memory profiler). Added unit testing of the new
printing facility.
Reviewed By: vitalybuka
Differential Revision: https://reviews.llvm.org/D87792
See https://reviews.llvm.org/D58620 for discussion, and for the commands
I ran. In addition I also ran
for f in $(svn diff | diffstat | grep .cc | cut -f 2 -d ' '); do rg $f . ; done
and manually updated (many) references to renamed files found by that.
llvm-svn: 367463
Teresa Johnson