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This reduces the required nosplit stack size, which permits building
on Solaris with -gcflags=all=-N -l.

Fixes #35046

Change-Id: Icb3a421bb791c73e2f670ecfadbe32daea79789f
Reviewed-on: https://go-review.googlesource.com/c/go/+/202446

Reviewed-by: Bryan C. Mills <bcmills@google.com>