Over the years we've had various bugs in pprof stack handling resulting
in appendLocsForStack crashing because stk is too short for a cached
location. i.e., the cached location claims several inlined frames. Those
should always appear together in stk. If some frames are missing from
stk, appendLocsForStack.
If we find this case, replace the slice out of bounds panic with an
explicit panic that contains more context.
Change-Id: I52725a689baf42b8db627ce3e1bc6c654ef245d4
Reviewed-on: https://go-review.googlesource.com/c/go/+/617135
Auto-Submit: Michael Pratt <mpratt@google.com> Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>