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 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 use and it doesn't meet the minimum version. This is useful when an
llvm feature has been backported to rust-llvm 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 * `compile-pass` for UI tests, indicates that the test is
supposed to compile, as opposed to the default where the test is supposed to compile, as opposed to the default where the test is
supposed to error out. supposed to error out.