Add src/test/ui regression testing for NLL#49900

Merged

bors merged 9 commits intorust-lang:masterfrom

pnkfelix:compare-mode-nll-followup-3

Apr 19, 2018

Commits on Apr 18, 2018

Expand `x.py test` to also run with `--compare-mode=nll` on src/test/ui suite.
pnkfelix
committed
Change output of `compiletest` to include the compare-mode when present.
pnkfelix
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Generate separate stamp files for `--compare-mode=nll`, and also use them. :)
pnkfelix
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Update the previously checkpointed (but unused by bors) tests to reflect current reality.
pnkfelix
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Trivial updates to `.nll.stderr` files post-rebase, reflecting s/-Znll/nll/ in messages.
pnkfelix
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Removed `.nll.stderr` files that currently match their corresponding `.stderr` files.
pnkfelix
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Work around rust-lang/rust#49998 with experimental code that does less updating of cause map.
pnkfelix
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Workaround rust-lang/rust#49998 by opting into experimental `-Z nll-subminimal-causes` flag
pnkfelix
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When running under compare-mode=nll, generate expected output to `foo.nll.stderr`
pnkfelix
committed