This reverts commit 52b71aa8b1a019403b0ecc184744b2f8ca2f7cba.
The problem was a missing lit.local.cfg file, which was causing the
test to be incorrectly run on bots that had not built the WebAssembly
target.
This reverts commit 94791970de109eb9a6b296825ddb0fc2a196b366.
The test is failing on multiple bots, event though it passes for me
locally. Reverting while I investigate further.
8cc911fa5b06 refactored the `getIntrinsicInstrCost` function and was
meant to be a nonfunctional change, but it accidentally changed how
costs were calculated in the SLP vectorizer, which regressed
WebAssembly codegen and resulted in a downstream bug report at
https://github.com/emscripten-core/emscripten/issues/11449.
The fix for this regression is in D85759, and this patch just
pre-commits the test from that patch to demonstrate the regressed
behavior first.
