cmd/compile: remove 8-byte alignment requirement of stack slot on mips64
cmd/compile: remove 8-byte alignment requirement of stack slot on mips64

This CL applies CL 267999 to mips64.

Updates #42385

Change-Id: Ideab21be0d8c1a36b3be7411b24adac70a3d16e0
Reviewed-on: https://go-review.googlesource.com/c/go/+/297771
Reviewed-by: eric fang <68c7b5ebe4a86ef7e52157f5950041656bf82310@arm.com>
Reviewed-by: Keith Randall <8c99c3a9284e493be632950b84cd789d08ed3e9d@golang.org>
Trust: eric fang <68c7b5ebe4a86ef7e52157f5950041656bf82310@arm.com>
Run-TryBot: eric fang <68c7b5ebe4a86ef7e52157f5950041656bf82310@arm.com>
TryBot-Result: Go Bot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

nawawi/go,golang/go,cloudflare/go,golang/go,nawawi/go,nawawi/go,cloudflare/go,golang/go,nawawi/go,cloudflare/go,cloudflare/go,golang/go,CAFxX/go,golang/go,nawawi/go,CAFxX/go,cloudflare/go,cloudflare/go,CAFxX/go,golang/go,cloudflare/go,nawawi/go,CAFxX/go,CAFxX/go,nawawi/go,CAFxX/go,golang/go,golang/go,nawawi/go,CAFxX/go,cloudflare/go,CAFxX/go