runtime: move evacuateX evacuateY relation check from makemap to evacuate
runtime: move evacuateX evacuateY relation check from makemap to evacuate

Move the check near the code in evacuate that relies on
the relation evacuateX+1 == evacuateY.

If the relation is fullfilled the check is known to be true
at compile time and removed by the compiler.

Change-Id: I711b75e09047bf347819ccaeec41d244a5883867
Reviewed-on: https://go-review.googlesource.com/62410
Run-TryBot: Martin Möhrmann <9c82b83f348009b39856043bb9ed3ef41e171aeb@google.com>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Keith Randall <8c99c3a9284e493be632950b84cd789d08ed3e9d@golang.org>

cloudflare/go,polyverse-security/go,akutz/go,cloudflare/go,polyverse-security/go,akutz/go,CAFxX/go,cloudflare/go,Cofyc/go,akutz/go,nawawi/go,josharian/go,CAFxX/go,codestation/go,akutz/go,polyverse-security/go,codestation/go,CAFxX/go,christopher-henderson/Go,Cofyc/go,Cofyc/go,josharian/go,golang/go,cloudflare/go,codestation/go,cloudflare/go,josharian/go,Cofyc/go,CAFxX/go,CAFxX/go,josharian/go,golang/go,CAFxX/go,nawawi/go,nawawi/go,golang/go,Cofyc/go,josharian/go,codestation/go,akutz/go,polyverse-security/go,akutz/go,codestation/go,cloudflare/go,nawawi/go,cloudflare/go,polyverse-security/go,polyverse-security/go,golang/go,josharian/go,akutz/go,Cofyc/go,CAFxX/go,codestation/go,nawawi/go,codestation/go,CAFxX/go,golang/go,polyverse-security/go,golang/go,nawawi/go,nawawi/go,Cofyc/go,Cofyc/go,polyverse-security/go,cloudflare/go,akutz/go,josharian/go,golang/go,josharian/go,golang/go,nawawi/go,codestation/go