[dev.ssa] cmd/compile/internal/ssa: implement ORETJMP

Change-Id: I352c7b9aab053959bc74c15861339e1dbe545ddc
Reviewed-on: https://go-review.googlesource.com/14404
Reviewed-by: David Chase <drchase@google.com>

src/cmd/compile/internal/ssa/gen/genericOps.go

@@ -376,13 +376,14 @@ var genericOps = []opData{
 //    First               nil    [always,never]
 
 var genericBlocks = []blockData{
-	{name: "Exit"},  // no successors.  There should only be 1 of these.
-	{name: "Dead"},  // no successors; determined to be dead but not yet removed
-	{name: "Plain"}, // a single successor
-	{name: "If"},    // 2 successors, if control goto Succs[0] else goto Succs[1]
-	{name: "Call"},  // 2 successors, normal return and panic
-	{name: "First"}, // 2 successors, always takes the first one (second is dead)
-	{name: "Ret"},   // 1 successor, branches to exit
+	{name: "Exit"},   // no successors.  There should only be 1 of these.
+	{name: "Dead"},   // no successors; determined to be dead but not yet removed
+	{name: "Plain"},  // a single successor
+	{name: "If"},     // 2 successors, if control goto Succs[0] else goto Succs[1]
+	{name: "Call"},   // 2 successors, normal return and panic
+	{name: "First"},  // 2 successors, always takes the first one (second is dead)
+	{name: "Ret"},    // 1 successor, branches to exit
+	{name: "RetJmp"}, // 1 successor, branches to exit.  Jumps to b.Aux.(*gc.Sym)
 }
 
 func init() {