test: fix nosplit test on 386

The 120->124 change in https://go-review.googlesource.com/c/go/+/61511/21/test/nosplit.go#143
looks accidental. Change back to 120.

Change-Id: I1690a8ae2d32756ba05544d2ed1baabfa64e1704
Reviewed-on: https://go-review.googlesource.com/131958
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

test/nosplit.go

@@ -140,7 +140,7 @@ main 104 nosplit call f; f 0 nosplit; REJECT ppc64 ppc64le arm64
 main 108 nosplit call f; f 0 nosplit; REJECT ppc64 ppc64le
 main 112 nosplit call f; f 0 nosplit; REJECT ppc64 ppc64le amd64 arm64
 main 116 nosplit call f; f 0 nosplit; REJECT ppc64 ppc64le amd64
-main 124 nosplit call f; f 0 nosplit; REJECT ppc64 ppc64le amd64 arm64
+main 120 nosplit call f; f 0 nosplit; REJECT ppc64 ppc64le amd64 arm64
 main 124 nosplit call f; f 0 nosplit; REJECT ppc64 ppc64le amd64 386
 main 128 nosplit call f; f 0 nosplit; REJECT
 main 132 nosplit call f; f 0 nosplit; REJECT