runtime: make sysMemStats' methods nosplit

runtime: make sysMemStats' methods nosplit

sysMemStats are updated early on in runtime initialization, so
triggering a stack growth would be bad. Mark them nosplit.

Thank you so much to cherryyz@google.com for finding this fix!

Fixes #42218.

Change-Id: Ic62db76e6a4f829355d7eaabed1727c51adfbd0f
Reviewed-on: https://go-review.googlesource.com/c/go/+/265157
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>