runtime: don't cache t.key.alg in evacuate
runtime: don't cache t.key.alg in evacuate

The number of times that alg has to be spilled
and restored makes it better to just reload it.

Change-Id: I2674752a889ecad59dab54da1d68fad03db1ca85
Reviewed-on: https://go-review.googlesource.com/56931
Run-TryBot: Josh Bleecher Snyder <cdc248cc4d32e4fbfe04e45228163bcecd48a0b9@gmail.com>
Reviewed-by: Daniel Martí <29bf28b42a938ace12a5819da4ed4ba03d82f315@mvdan.cc>
Reviewed-by: Keith Randall <8c99c3a9284e493be632950b84cd789d08ed3e9d@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

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