go/internal/gcimporter: remove the sanitizeName helper
go/internal/gcimporter: remove the sanitizeName helper

It not necessary to sanitize object/type strings produced by go/types,
because they no longer contain subscripts.

Change-Id: I3ed41359d59b01ab2cf2ad4a6b587635ce4cecf2
Reviewed-on: https://go-review.googlesource.com/c/tools/+/379854
Trust: Robert Findley <9179eee875d1ee628c37fb47d7e749e855ffd21f@google.com>
Run-TryBot: Robert Findley <9179eee875d1ee628c37fb47d7e749e855ffd21f@google.com>
Reviewed-by: Robert Griesemer <a6752097faebf1f02d80107d77a9be009089afe3@golang.org>
gopls-CI: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
TryBot-Result: Gopher Robot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

golang/tools,golang/tools,golang/tools,golang/tools,golang/tools