Commits on Dec 20, 2022

1. test: add tests for pthread API …

   This change runs the pthread tests available in `libc-test` when
   `THREAD_MODEL=posix`. This is currently a work-in-progress, since there
   are custom build steps necessary to get this all to (mostly) work.
   Currently this might look like:
   
   ```console
   $ cd test
   $ make run THREAD_MODEL=posix \
       ENGINE=~/Code/wasmtime/target/debug/wasmtime \
       CC=~/Code/llvm-project/build/bin/clang
   ```
   
   What are the current issues?
   - this requires a special build of Wasmtime that includes the
     `wasi-threads` implementation; this is shown above as built from
     source
   - under `THREAD_MODEL=posix`, this requires Clang to understand the
     `--export-memory` flag which, though merged in
     https://reviews.llvm.org/D135898, is not available for download yet
     (but can be built from latest source as shown above)
   - not all of the tests yet pass and some do not build: this is to be
     expected in several cases (PI? robust?) but there is perhaps more that
     can be done here to enable more of the pthread API. Only the working
     tests are included in this commit.

   

   abrown committed Dec 20, 2022
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