[dev.typeparams] cmd/compile: don't print out node pointer in ir.Dump

This has been a part of the node dumping since the very beginning, but
this makes diffing -W output pretty annoying. -d=dumpptrs already prints
these out if needed.

Change-Id: I9524a7f7b44ec780ae42a8a2a9588f11ab3950f9
Reviewed-on: https://go-review.googlesource.com/c/go/+/340253
Reviewed-by: Dan Scales <danscales@google.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Trust: Dan Scales <danscales@google.com>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
diff --git a/src/cmd/compile/internal/ir/fmt.go b/src/cmd/compile/internal/ir/fmt.go
index 3c5a928..d19fe45 100644
--- a/src/cmd/compile/internal/ir/fmt.go
+++ b/src/cmd/compile/internal/ir/fmt.go
@@ -1006,7 +1006,7 @@
 
 // Dump prints the message s followed by a debug dump of n.
 func Dump(s string, n Node) {
-	fmt.Printf("%s [%p]%+v\n", s, n, n)
+	fmt.Printf("%s%+v\n", s, n)
 }
 
 // DumpList prints the message s followed by a debug dump of each node in the list.