[llvm] [bazel] Add td_library target for OptParser.td (PR #86363)

[Keith Smiley via llvm-commits]

================
@@ -5338,3 +5339,9 @@ cc_binary(
         ":Support",
     ],
 )
+
+td_library(
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keith wrote:

sure, moved it way up since it should always be a leaf node

https://github.com/llvm/llvm-project/pull/86363