* Kick out of normalizePath if there's nothing to do
...using `relativePathSegmentRegExp`.
Bonus: use a regex to handle "/./" to avoid splitting and joining in a
common case.
When building the compiler, for example, it looks like ~95% of arguments
to `normalizePath` do not require any normalization.
* Check normalization before and after . cleanup
* Also cleanup leading ./
* Make normalizeSlashes a no-op there are no bad slashes
On Windows, there will probably be a negligible slowdown, iterating over
the pre-slash prefix of each unnormalized path (though we might come out
ahead if paths are normalized more than once).
On *nix, this saves work - 1.8s -> 0.4s in the project I'm
investigating.
* Reuse already-computed index
* Create symlink cache when a pnpm module is found
* Keep pnpm-internal symlinks out of the symlink cache
* Filter out pnpm path from realpath module specifier too
* Optimize symlink module specifier generation
* Add trailing directory separators
* Remove unneeded change
* Fix paths losing case in cache
* Fix missing absolutification
* Optionally stop looking for the default configured project at
node_modules
* Make stopping at node_modules non-optional
* Generalize and simplify the change - node_modules files don't have default configured projects
