Eric Miotto b903a6cc65 Put symbol generation logic under test ...

...before adding the logic to filter paths

In particular:
* print the list of files that `cpio` copies, so we can test explicitly
  which files end up in the symroot (and also see those when asking for
  a toolchain in PR testing)
* use `find` instead of `grep` to filter files we want symbols generated
  for -- this is to avoid the script failing when there are no symbol to
  process, especially in lit tests
* remove an unnecessary check for `swift-api-digester` -- this is now a
  symlink to `swift-frontend` and we only process regular files.

Supports rdar://76865276

2021-05-12 09:52:30 -07:00

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