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

[Keith Smiley via llvm-commits]

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@@ -4,6 +4,7 @@
 
 load("@bazel_skylib//rules:common_settings.bzl", "string_flag")
 load("@bazel_skylib//rules:expand_template.bzl", "expand_template")
+load("//mlir:tblgen.bzl", "td_library")
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keith wrote:

this is potentially a bit weird to depend on here, any thoughts?

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