Actually set the SPIR-V generator magic number (#743)

wow this took a while to do

Author: khyperia

crates/rustc_codegen_spirv/src/builder_spirv.rs

@@ -338,6 +338,7 @@ impl BuilderSpirv {
 
         let mut builder = Builder::new();
         builder.set_version(version.0, version.1);
+        builder.module_mut().header.as_mut().unwrap().generator = 0x001B_0000;
 
         let mut enabled_capabilities = FxHashSet::default();
         let mut enabled_extensions = FxHashSet::default();

crates/rustc_codegen_spirv/src/linker/mod.rs

@@ -108,6 +108,7 @@ pub fn link(sess: &Session, mut inputs: Vec<Module>, opts: &Options) -> Result<L
         let mut output = loader.module();
         let mut header = ModuleHeader::new(bound + 1);
         header.set_version(version.0, version.1);
+        header.generator = 0x001B_0000;
         output.header = Some(header);
         output
     };