Unify thread ID allocation between Wasm Workers and pthreads. NFC (#2…

…6670)

Followup to #26660 and #26472

[WasmFS] Allow reading from char devices in the Node backend (#26599)

Split out from #24733, this fixes a test failure in
`other.test_fs_dev_random_wasmfs_rawfs` from that PR.

[EH] Add more explanation to EXPORT_EXCEPTION_HANDLING_HELPERS deprec…

…ation (#26517)

Like WebAssembly/binaryen#8507, there can be
people who use this methods at `-O1` or above. This adds more
explanation of the workaround in ChangeeLog, site docs, and the
deprecation message. You don't strictly need
`decrementExceptionRefcount` to use `getExceptionMessage`, but you need
it if you care about asan, because exceptions thrown in Wasm and caught
in JS don't get freed unless you explicitly decrement the refcount.

Add clang-format-diff to github actions (#26445)

Back again with another attempt at #12446 after 6 years.

If this proves to be too aggressive/annoying we can dial it back somehow
or disable it.

Enable emscripten_futex API for Wasm Workers (#26325)

This involves also including `emscripten_thread_state.S` which provides
APIs such as `emscripten_is_main_runtime_thread` and
emscripten_is_main_browser_thread` which now also work in Wasm Workers.

There is a minor code size hit here of ~80 bytes, but I think its
worth it to have these low level APIs available everywhere.

Depends on: #26309
Fixes: #26314

Remove `MainLoop.method`. NFC (#26254)

The `MainLoop.method` property seems to be a string version of
`MainLoop.timingMode`.

It had exactly one user which was to generate a warning. The warning was
firing in the case when the method was `timeout` (which is the same as
`timingMode` == `EM_TIMING_SETTIMEOUT`). The warning code would then
reset `MainLoop.method` so that it would only fire "once per set main
loop". However, since this was changed to `warnOnce` in #10090, the
warning actually only fires once per program run.

Update llvm-libc readme to LLVM 21.1.8 (#26157)

Missing from #26151. The newly added parts are copied from
https://github.com/emscripten-core/emscripten/blob/main/system/lib/libcxx/readme.txt,
which is synced with LLVM releases.

Fix preprocess_c_code() function to work under Closure optimization. (#…

…26051)

Fix `preprocess_c_code()` JS library function to work under Closure
optimization.

---------

Co-authored-by: Alon Zakai <alonzakai@gmail.com>

Fix other.test_install after two PRs raced to land. NFC (#25969)

Warn about DWARF inhibiting binaryen opts only when binaryen optimizes (

#25889)

If we don't optimize, the warning can be confusing.