go.tools/ssa: un-export Function.FullName. Use String.
R=gri
CC=golang-dev
https://golang.org/cl/10604044
diff --git a/ssa/ssa.go b/ssa/ssa.go
index 354db2e..14ab40a 100644
--- a/ssa/ssa.go
+++ b/ssa/ssa.go
@@ -1230,8 +1230,10 @@
// Signature returns the signature of the called function.
//
// For an "invoke"-mode call, the signature of the interface method is
-// returned; the receiver is represented by sig.Recv, not
-// sig.Params().At(0).
+// returned.
+//
+// In either "call" or "invoke" mode, if the callee is a method, its
+// receiver is represented by sig.Recv, not sig.Params().At(0).
//
func (c *CallCommon) Signature() *types.Signature {
if c.Recv != nil {
