Document ignore-llvm-version

This documents the ignore-llvm-version directive.
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Tom Tromey 2018-11-06 14:47:56 -07:00 committed by Who? Me?!
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required for this test; the test is ignored if the system llvm is in
use and it doesn't meet the minimum version. This is useful when an
llvm feature has been backported to rust-llvm
* `ignore-llvm-version` can be used to skip the test when certain LLVM
versions are used. This takes one or two arguments; the first
argument is the first version to ignore. If no second argument is
given, all subsequent versions are ignored; otherwise, the second
argument is the last version to ignore.
* `compile-pass` for UI tests, indicates that the test is
supposed to compile, as opposed to the default where the test is
supposed to error out.