cmd/compile: respect Node.Bounded when inserting OpArraySelect

cmd/compile: respect Node.Bounded when inserting OpArraySelect

This triggers 119 times during make.bash.

This CL reduces the time it takes for the
compiler to panic while compiling the code in #19751
from 22 minutes to 15 minutes. Yay, I guess.

Updates #19751

Change-Id: I8ca7f1ae75f89d1eb2a361d67b3055a975221734
Reviewed-on: https://go-review.googlesource.com/39294
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>