Currently, reflect.ValueOf forces the referenced object to be heap
allocated. This CL makes it possible to be stack allocated. We
need to be careful to make sure the compiler's escape analysis can
do the right thing, e.g. channel send, map assignment, unsafe
pointer conversions.
Tests will be added in a later CL.
CL 408827 might help ensure the correctness.
Change-Id: I8663651370c7c8108584902235062dd2b3f65954
Reviewed-on: https://go-review.googlesource.com/c/go/+/408826
Run-TryBot: Cherry Mui <cherryyz@google.com> Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Austin Clements <austin@google.com>