Prettify MIR graphviz output

[nagisa]

One will look at graphviz often when working with MIR, so may as well make the tables a bit more
pretty :)

[rust-highfive]

r? @arielb1

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[luqmana]

@bors: r+

[bors]

📌 Commit d34417e has been approved by luqmana

[eddyb]

cc @tsion

[solson]

I have a PR that makes larger changes to the graphviz output, but I see no reason not to merge this now. Most of my changes are for the textual parts (especially constants). I don't have the cornsilk colored terminators, but I could add that if desired. :)

I'll try to get my PR ready ASAP.

[nagisa]

Fixed the build failure, re-r+?

---

@tsion sounds like our patches are pretty unrelated then? Either way, I’m completely fine rebasing onto you or you rebasing onto/merging me.

[solson]

@nagisa I'll rebase onto yours. That'll be much simpler.

[luqmana]

@bors: r+

[bors]

📌 Commit 03903cb has been approved by luqmana

[bors]

⌛ Testing commit 03903cb with merge 48075cc...

[bors]

💔 Test failed - auto-win-gnu-32-opt

[alexcrichton]

@bors: retry

On Sun, Dec 20, 2015 at 2:57 AM, bors notifications@github.com wrote:

[image: 💔] Test failed - auto-win-gnu-32-opt
http://buildbot.rust-lang.org/builders/auto-win-gnu-32-opt/builds/2476

—
Reply to this email directly or view it on GitHub
#30469 (comment).

[bors]

⌛ Testing commit 03903cb with merge 19c997e...

[bors]

☀️ Test successful - auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-64-debug-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-x-android-t, auto-linux-cross-opt, auto-linux-musl-64-opt, auto-mac-32-opt, auto-mac-64-nopt-t, auto-mac-64-opt, auto-win-gnu-32-nopt-t, auto-win-gnu-32-opt, auto-win-gnu-64-nopt-t, auto-win-gnu-64-opt, auto-win-msvc-32-opt, auto-win-msvc-64-opt