Document the Clang fix for Threads::Task when accessing the return value. The corresponding patch accidentally got committed as part of r26233.
Document the Clang fix for Threads::Task when accessing the return value. The corresponding patch accidentally got committed as part of r26233.

git-svn-id: 31d9d2f6432a47c86a3640814024c107794ea77c@26245 0785d39b-7218-0410-832d-ea1e28bc413d

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