compiler: use fully-qualified names for tracking functions

Function name now consists of 3 parts:
1) full package path
2) method receiver type (if any)
3) function name itself .

Fix #1150.

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

pkg/compiler/debug.go

@@ -152,6 +152,8 @@ func (c *codegen) methodInfoFromScope(name string, scope *funcScope) *MethodDebu
 			})
 		}
 	}
+	ss := strings.Split(name, ".")
+	name = ss[len(ss)-1]
 	return &MethodDebugInfo{
 		ID: name,
 		Name: DebugMethodName{