pnpm version: 2.13.5

Code to reproduce the issue:

Run pnpm install --shrinkwrap-only.

My understanding was that this feature allows people to update their shrinkwrap.yaml file very quickly, in situations where they aren't going to be building anything locally, so they don't need their node_modules folder to be updated. (For example, I'm going to push the updated shrinkwrap.yaml to a PR branch, and I optimistically expect the PR build to succeed, so there's no reason to build it locally.)

Expected behavior:

Run pnpm install --shrinkwrap-only runs very quickly.

Actual behavior:

Run pnpm install --shrinkwrap-only takes about the same amount of time as a regular pnpm install --shrinkwrap-only.

If that's by design, perhaps we should deprecate the --shrinkwrap-only flag? Or perhaps I am misunderstanding its purpose?

Additional information:

This is apparently a recent regression due to the work with corgi headers. See @nickpape-msft 's comments on #1177 (comment) for background.

• node -v prints: 8.9.4
• Windows, OS X, or Linux?: Windows