[lit] Document the 'available_features' member of the config object.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@276744 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/docs/CommandGuide/lit.rst b/docs/CommandGuide/lit.rst
index b2da58e..7fc3455 100644 (file)
--- a/docs/CommandGuide/lit.rst
+++ b/docs/CommandGuide/lit.rst
@@ -324,6 +324,9 @@ executed, two important global variables are predefined:
  on the pipe fail. If this is not desired, setting this variable to false
  makes the test fail only if the last command in the pipe fails.
 
+ **available_features** A set of features that can be used in `XFAIL`,
+ `REQUIRES`, and `UNSUPPORTED` directives.
+
 TEST DISCOVERY
 ~~~~~~~~~~~~~~