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if i run a pex file with `PEX_PROFILE_FILENAME=out.prof`, i can get the profile of the pex process. if that process itself depends on the `pex` library and invokes `pex.resolver.resolve()`, though, all i see from the profile is how long we waited on the pip subprocess to resolve 3rdparty dependencies. i'm trying to research this now -- is there an obvious way to get the profile of the pip subprocess?

(John is on a trip the next few days - not sure what his Internet access will look like)

i'm just using this to investigate a single performance issue, so i can hack it in for now

this is less of a pex question and more of a general python question too. i suspect i'll be able to find a good answer.

context: <https://github.com/pantsbuild/pants/pull/8793#issuecomment-578985669>

just hacked pex to call `py-spy` on the `pip` command-line

actually realized that we run pip as a pex

so we can just set `PEX_PROFILE_FILENAME` in the env