compiler: permit inlining receive expressions

This does not permit any new inlinable functions in the standard library.

Change-Id: Iae19b3b061db862b9991074f8172e30070cd550f
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/176637
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
2 files changed