Remove --incompatible_do_not_split_linking_cmdline#29931
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The flag was introduced disabled in March 2019 by 3010e57 to migrate C++ linking away from GCC-specific command-line splitting. It was enabled by default in May 2019 by 28c8a8c. The conditional implementation and legacy behavior were removed in February 2021 by 4d75da6, leaving only Starlark semantics bookkeeping. Remove the option, semantics key, and consistency-test rows. RELNOTES: Remove the no-op --incompatible_do_not_split_linking_cmdline flag.
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See bazelbuild/bazel#29931 -- this is going away in upstream Bazel as well and has been a no-op since 2021.
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--incompatible_do_not_split_linking_cmdlinewas introduced disabled in March 2019 by 3010e57805 to migrate C++ linking away from GCC-specific command-line splitting; #7670 and #7687 tracked the migration. It was enabled by default in May 2019 by 28c8a8c91f. The conditional implementation and legacy behavior were removed in February 2021 by 4d75da6323, leaving the option with no consumer beyond Starlark semantics bookkeeping.This removes the option, semantics key, and consistency-test rows.
Validation:
bazel test --jobs=4 --disk_cache=/private/tmp/bazel-pr-disk-cache //src/test/java/com/google/devtools/build/lib/packages/semantics:ConsistencyTest.