Revert "cmd/compile: cleanup toolstash hacks from previous CL"

This partially reverts commit 01bf5cc2.

For unknown reasons, this CL was causing an internal test to allocate
1.2GB when it used to allocate less than 300MB.

Change-Id: I41d767781e0ae9e43bf670e2a186ee074821eca4
Reviewed-on: https://go-review.googlesource.com/31674Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/cmd/compile/internal/gc/inl.go

@@ -248,6 +248,10 @@ func ishairy(n *Node, budget *int32, reason *string) bool {
 	}
 
 	(*budget)--
+	// TODO(mdempsky): Hack to appease toolstash; remove.
+	if n.Op == OSTRUCTKEY {
+		(*budget)--
+	}
 
 	return *budget < 0 || ishairy(n.Left, budget, reason) || ishairy(n.Right, budget, reason) ||
 		ishairylist(n.List, budget, reason) || ishairylist(n.Rlist, budget, reason) ||