internal/runtime/maps: move tombstone test to swiss file
This test fails on GOEXPERIMENT=noswissmap as it is testing behavior
specific to swissmaps. Move it to map_swiss_test.go to skip it on
noswissmap.
We could also switch the test to use NewTestMap, which provides a
swissmap even in GOEXPERIMENT=noswissmap, but that is tedious to use and
noswissmap is going away soon anyway.
For #70886.
Cq-Include-Trybots: luci.golang.try:gotip-linux-amd64-longtest-noswissmap
Change-Id: I6a6a636c5ec72217d936cd01e9da36ae127ea2c5
Reviewed-on: https://go-review.googlesource.com/c/go/+/666437 Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>