With CL 408826, CL 413474, etc. reflect.ValueOf no longer
unconditionally escapes its argument, allowing a Value's content
to be allocated on the stack.
Change-Id: I3a0af85c11e2fd0df42b056095565f0ce5548886
Reviewed-on: https://go-review.googlesource.com/c/go/+/494657
TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com> Reviewed-by: Austin Clements <austin@google.com>