WorkWrap: Update Unfolding with WW'd body prior to `tryWW` (#20510)

We have a function in #20510 that is small enough to get a stable unfolding in WW:
```hs
small :: Int -> Int
small x = go 0 x
  where
    go z 0 = z * x
    go z y = go (z+y) (y-1)
```
But it appears we failed to use the WW'd RHS as the stable unfolding. As a result,
inlining `small` would expose the non-WW'd version of `go`. That appears to regress
badly in #19727 which is a bit too large to extract a reproducer from that is
guaranteed to reproduce across GHC versions.

The solution is to simply update the unfolding in `certainlyWillInline` with the
WW'd RHS.

Fixes #20510.

0 files changed, 0 insertions, 0 deletions