[dev.ssa] cmd/compile: Move runtime call gen to its own function

Change-Id: I5de36244de4dcc4a9827ee0fa04526e3e3578e7f
Reviewed-on: https://go-review.googlesource.com/14755
Reviewed-by: David Chase <drchase@google.com>
diff --git a/src/cmd/compile/internal/gc/go.go b/src/cmd/compile/internal/gc/go.go
index 424e647..a0c1ab8 100644
--- a/src/cmd/compile/internal/gc/go.go
+++ b/src/cmd/compile/internal/gc/go.go
@@ -866,3 +866,9 @@
 var panicslice *Node
 
 var throwreturn *Node
+
+var growslice *Node
+
+var typedmemmove_nostore *Node
+
+var panicdottype *Node