[cfe-dev] Fwd: Merging template type diffing changes into 3.8 branch

[Richard Trieu via cfe-dev]

Oops, send to old mailing list, trying again.

I would like to get the following changes merged into 3.8

r257831
r257838
r257853
r257861
r257869
r257870

These changes are for fixing issues with template type diffing, including a
number of asserts from edge cases, at least one mistake in printing, and a
lot of general refactoring.  There is a large amount of lines changed, but
it is confined to one code file and two tests.
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