compiler: drop special handling of unexported func/var assembler names

For example, for the package math/big, we used to generate unexported
names as `big.trim` and exported names as `math_big.NewInt`.  After
this change we will use `math_big` consistently.

Change-Id: Ie7cf87f1bebfe4e90ad58d328521d7910e156d28
Reviewed-on: https://go-review.googlesource.com/68651
Reviewed-by: Than McIntosh <thanm@google.com>
3 files changed