cmd/compile: collapse runs of string constants in walkprint

cmd/compile: collapse runs of string constants in walkprint

This reduces the code footprint of code like:

println("foo=", foo, "bar=", bar)

which is fairly common in the runtime.

Prior to this change, this makes function calls to print each of:

"foo=", " ", foo, " ", "bar=", " ", bar, "\n"

After this change, this prints:

"foo= ", foo, " bar= ", bar, "\n"

This shrinks the hello world binary by 0.4%.
More importantly, this improves the instruction
density of important runtime routines.

Change-Id: I8971bdf5382fbaaf4a82bad4442f9da07c28d395
Reviewed-on: https://go-review.googlesource.com/55098
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>