runtime: skip stack barrier copy when there are no pointers
After CL 31455, "go fun(n)" may put "n" to write barrier buffer when there are no pointers in fun's arguments. Fixes #29362 Change-Id: Icfa42b8759ce8ad9267dcb3859c626feb6fda381 Reviewed-on: https://go-review.googlesource.com/c/155779Reviewed-by:Keith Randall <khr@golang.org>
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