Merkle tree cache doesn't cache tree artifacts #17923
Description
Description of the bug:
When --experimental_remote_merkle_tree_cache is set, Bazel will cache the non-leaf nodes in the NestedSet when building merkle tree. However, tree artifacts are leaf nodes in the NestedSet so they are never cached. For some builds, one tree artifact could contain hundreds of thousands files, caching tree artifact could improve the performance.
Related #17804.
What's the simplest, easiest way to reproduce this bug? Please provide a minimal example if possible.
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Which operating system are you running Bazel on?
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What is the output of bazel info release?
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If bazel info release returns development version or (@non-git), tell us how you built Bazel.
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What's the output of git remote get-url origin; git rev-parse master; git rev-parse HEAD ?
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Have you found anything relevant by searching the web?
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Any other information, logs, or outputs that you want to share?
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