cmd/go: make build cache tag sensitive to GOSSADIR; remove unused
GOSSADIR is a useful compiler flag for debugging.
Removed GO_SSA_PHI_LOC_CUTOFF, it is no longer mentioned in the compiler.
Change-Id: I3600f4c6ded95c9d34b85a6f0da6ba89b17a13ec
Reviewed-on: https://go-review.googlesource.com/c/go/+/312290
Trust: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Than McIntosh <thanm@google.com>