pytorch

614dce54 - [iOS GPU] Fix Shader compilation errors for Metal 1.2 (iOS 12) (#56670)

[iOS GPU] Fix Shader compilation errors for Metal 1.2 (iOS 12) (#56670) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/56670 `int64_t` is only available for Metal 2.2 and above. `size_t` works fine in those situations. https://developer.apple.com/metal/Metal-Shading-Language-Specification.pdf ghstack-source-id: 127169610 Test Plan: - AIBench ``` buck run mode/mac aibench:run_bench_macos -- -b aibench/specifications/models/pytorch/metal/metal_unet_1001_detection.json --platform ios --framework pytorch --remote --devices D201 (https://github.com/pytorch/pytorch/commit/85b1c45a456591bafd51ca79b8a03cca59f90fde)AP-12.0.1 ``` Reviewed By: linbinyu Differential Revision: D27933297 fbshipit-source-id: 474b1eb191c68101367c9623c855645684434bd7