Currently compiling text_llm_runner.cpp requires a dependency to libsentencepiece.a and Xcode requires that library to be installed

at a directory in ${TEMP_DIR}/cmake/lib

For example on my laptop:

/Users/larryliu/Library/Developer/Xcode/DerivedData/Benchmark-dvseychddztwtucwgxpumwmyedfh/Build/Intermediates.noindex/Benchmark.build/Release-iphoneos/Tests.build/cmake/lib

Before we don't install sentencepiece, this PR changes it to install it.

To see the diff clearly: use this link https://www.internalfb.com/intern/diffing/?paste_number=1846901681

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/11834

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✅ You can merge normally! (2 Unrelated Failures)

As of commit bbbd91c with merge base 496cb05 ():

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• trunk / test-demo-backend-delegation (buck2) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.

BROKEN TRUNK - The following job failed but was present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / android / run-emulator (gh) (trunk failure)
  The process '/usr/bin/sh' failed with exit code 255

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Is this also applicable to the LLaMA demo app?

Is this also applicable to the LLaMA demo app?

Yep you are right, let me add that

Apple / build-benchmark-app passed. Accepted to unblock continuous benchmarking