Fixed a bug in my visitor that tests if an Expr or Stmt branches in a particular var. The scope was not being correctly populated with let bound vars.
Fixed a bug in my visitor that tests if an Expr or Stmt branches in a particular var. The scope was not being correctly populated with let bound vars.


Former-commit-id: 59cf281a267dbbc62c9a4ef4592d43dfb08a1c8e
Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide