cmd/compile/internal/inline/inlheur: remove pkg-level call site table
Remove the global package-level call site table; no need to have this
around since we can just iterate over the function-level tables where
needed, saving a bit of memory. No change in inliner or heuristics
functionality.
Change-Id: I319a56cb766178e98b7eebc7c577a0336828ce0c
Reviewed-on: https://go-review.googlesource.com/c/go/+/530576 Reviewed-by: Matthew Dempsky <mdempsky@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>