Vulkan spirv debug symbols (pytorch#7182)

Summary:

Add a flag to optionally include the shader source in the generated spv and make it default on windows.

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Reviewed By: SS-JIA

Differential Revision: D66778427

Author: Abhi-hpp

backends/vulkan/runtime/gen_vulkan_spv.py

@@ -1052,6 +1052,7 @@ def main(argv: List[str]) -> int:
     parser.add_argument("--replace-u16vecn", action="store_true", default=False)
     parser.add_argument("--optimize_size", action="store_true", help="")
     parser.add_argument("--optimize", action="store_true", help="")
+    parser.add_argument("--spv_debug", action="store_true", default=False)
     parser.add_argument(
         "--env", metavar="KEY=VALUE", nargs="*", help="Set a number of key-value pairs"
     )
@@ -1075,6 +1076,8 @@ def main(argv: List[str]) -> int:
         glslc_flags += "-Os"
     elif options.optimize:
         glslc_flags += "-O"
+    if options.spv_debug:
+        glslc_flags += "-g"
 
     shader_generator = SPVGenerator(
         options.glsl_paths,

backends/vulkan/targets.bzl

@@ -43,6 +43,7 @@ def vulkan_spv_shader_lib(name, spv_filegroups, is_fbcode = False, no_volk = Fal
             "DEFAULT": "",
             "ovr_config//os:android": "--optimize",
             "ovr_config//os:linux": "--replace-u16vecn",
+            "ovr_config//os:windows": "--optimize --spv_debug",
         })
     )