Add a couple more places where Metal needs to be mentioned.
Add a couple more places where Metal needs to be mentioned.


Former-commit-id: 692f65ebef9d5715e9e6a9e4823e5a5b283e29da
darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide