[man page] Document -gline-tables-only in the clang man page.
[man page] Document -gline-tables-only in the clang man page.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@275076 91177308-0d34-0410-b5e6-96231b3b80d8
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