[llvm] [WebAssembly][FastISel] Fold AND mask operations into ZExt load (PR #183743)

[Derek Schuff via llvm-commits]

dschuff wrote:

OK yeah sorry I started the test just before you merged the PR;  my script uses `gh` to apply the PR to run the tests, and it uses the branch (and it looks like the fix wasn't on the branch). And I didn't look at the error report, I was trying to  get it posted before I quit for the day :)

To run emscripten tests you can follow the docs at https://emscripten.org/docs/getting_started/test-suite.html#emscripten-test-suite. It's a slight pain to set up to test Emscripten, but maybe worth it if you're going to be doing Wasm development regularly (our coverage in LLVM proper seems unfortuately a bit inadequate).
I'm also working on a script that will hopefully make it easier to run proposed LLVM changes against the Emscripten tests. I'm hoping to get it to where I can semi-automatically generate reports like that one and just run them myself for all Wasm PRs, (one step short of having true CI).

https://github.com/llvm/llvm-project/pull/183743